Add missing libraries to README.md

Author: stephentoub

README.md

@@ -92,6 +92,7 @@ More libraries are coming soon (the overall list of items we currently plan to m
 |**System.ObjectModel**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.ObjectModel.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types and interfaces that enable the creation of observable types that provide notifications to clients when changes are made.</sub>|
 |**System.Reflection**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Reflection.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types that retrieve information about assemblies, modules, members, parameters, and other entities in managed code by examining their metadata.</sub>|
 |**System.Reflection.DispatchProxy**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Reflection.DispatchProxy.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides a mechanism for dynamically creating proxy types that implement a specified interface and derive from a specified DispatchProxy type.</sub>|
+|**System.Reflection.Emit.ILGeneration**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Reflection.Emit.ILGeneration.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types that allow a compiler or other tool to emit Microsoft intermediate language (MSIL).</sub>|
 |**System.Reflection.Emit.Lightweight**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Reflection.Emit.Lightweight.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides the System.Reflection.Emit.DynamicMethod class, which represents a dynamic method that can be compiled, executed, and discarded.</sub>|
 |**System.Reflection.Extensions**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Reflection.Extensions.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides custom attribute extension methods for System.Reflection types.</sub>|
 |**System.Reflection.Metadata**<br/>[![MyGet Package](https://img.shields.io/nuget/vpre/System.Reflection.Metadata.svg)](http://www.nuget.org/packages/System.Reflection.Metadata/)|<sub>Provides a highly-tuned, low-level ECMA-335 metadata reader.  This is the same reader used by "[Roslyn]" C# and Visual Basic compilers to parse assemblies.</sub>|
@@ -109,9 +110,12 @@ More libraries are coming soon (the overall list of items we currently plan to m
 |**System.Security.Cryptography.DeriveBytes**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.DeriveBytes.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides the System.Security.Cryptography.Rfc2898DeriveBytes class, which implements password-based key derivation functionality per [RFC 2898](http://www.ietf.org/rfc/rfc2898.txt).</sub>|
 |**System.Security.Cryptography.Encoding**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.Encoding.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types for representing Abstract Syntax Notation One (ASN.1)-encoded data.</sub>|
 |**System.Security.Cryptography.Encryption**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.Encryption.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides base types for symmetric and asymmetric cryptographic algorithms.</sub>|
+|**System.Security.Cryptography.Encryption.Aes**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.Encryption.Aes.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types which perform symmetric encryption and decryption using the Advanced Encryption Standard (AES) algorithm.</sub>|
 |**System.Security.Cryptography.Hashing**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.Hashing.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides base types for cryptographic hashing and hash-based message authentication code (HMAC).</sub>|
 |**System.Security.Cryptography.Hashing.Algorithms**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.Hashing.Algorithms.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides concrete implementations of cryptographic hashing and hash-based message authentication code (HMAC), including MD5, SHA-1, and SHA-2.</sub>|
 |**System.Security.Cryptography.RandomNumberGenerator**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.RandomNumberGenerator.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides the System.Security.Cryptography.RandomNumberGenerator class, which generates cryptographically secure random numbers.</sub>|
+|**System.Security.Cryptography.RSA**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.RSA.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types which perform asymmetric encryption and decryption using the RSA algorithm.</sub>|
+|**System.Security.Cryptography.X509Certificates**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Cryptography.X509Certificates.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides types for reading, exporting and verifying Authenticode X.509 v3 certificates.</sub>|
 |**System.Security.Principal**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Principal.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides the base interfaces for principal and identity objects that represent the security context under which code is running.</sub>|
 |**System.Security.Principal.Windows**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.Principal.Windows.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides classes for retrieving the current Windows user and for interacting with Windows users and groups.</sub>|
 |**System.Security.SecureString**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Security.SecureString.svg)](https://www.myget.org/gallery/dotnet-core)|<sub>Provides support for accessing and modifying text that should be kept confidential.</sub>|