adding c# language (#84)

* adding c# language

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

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* Update lang/csharp.md

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* Update lang/csharp.md

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* Update lang/csharp.md

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update lang/csharp.md

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* Update lang/csharp.md

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* Update lang/csharp.md

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update lang/csharp.md

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update lang/csharp.md

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* Update lang/csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>

* added command

* Update csharp.md

Co-authored-by: Anshumaan Kumar Prasad <75872316+amino19@users.noreply.github.com>
Co-authored-by: David Leal <halfpacho@gmail.com>

Author: 3 people

lang/csharp.md

@@ -0,0 +1,82 @@
+---
+lang: C#
+syntax: cs
+title: Why do Java programmers have to wear glasses? Because they don’t C#.
+author: hey-mikey
+---
+
+```cs
+public class HelloWorld {
+    public static void Main(string[] args) {
+        Console.WriteLine("Hello, World!"); 
+        /* this keeps the console open instead of 
+         * printing the line and immediately closing. 
+         */
+        Console.ReadLine(); 
+    }
+}
+```
+
+## 🤔 What is C#?
+
+ - C# is a language developed by Microsoft in 2000 to address the growing interest in web applications. It was written by Anders
+   Hejlsberg, who also worked on Turbo Pascal and Delphi.
+ - It's useful for desktop applications as well as mobile and cross-platform applications, too.
+ - With the Unity game engine, developers can also create games with C#
+
+## 📈 Why to use C#?
+
+ - C# is remarkably scalable and easy to maintain.  
+ - It's good for beginners, especially beginners with experience with Java or C++ because the code syntax is very similar
+ - It's possible to write applications for desktop, web, mobile, games, and cross-platform with C#. Cool stuff!
+ - C# is statically-typed and easy to read, and it's object-oriented, another thing it has in common with Java.
+ - [According to a 2020 StackOverflow study](https://insights.stackoverflow.com/survey/2020#technology-most-loved-dreaded-and-wanted-languages-loved), C# is an in-demand skill and among the top ten languages used.
+
+## 🛠️ Setting up C# development environment
+
+### 💻 To use on Linux or macOS
+
+To start building .NET apps, download and install the [.NET SDK (Software Development Kit)](https://download.visualstudio.microsoft.com/download/pr/8a504918-9508-464d-80c6-4da7f9cc9ac6/f9d6ad00bbd798bafb549101b5b4a4c0/dotnet-sdk-5.0.402-win-x64.exe)
+
+Once you've installed, open a new command prompt and run the following command:
+```sh
+dotnet
+```
+If you receive a 'dotnet is not recognized as an internal or external command' error, make sure you opened a new command prompt. 
+
+In the command prompt again, write
+```sh
+dotnet new console -o myApp
+```
+then navigate to that directory
+```sh
+cd myApp
+```
+The main file in the myApp folder is Program.cs. By default it's already written to print "Hello World!" to the Console.
+
+### 📎 Using it on Windows
+
+1. Download and install the free version of [Visual Studio](https://visualstudio.microsoft.com/downloads).
+2. Open Visual Studio, and choose "Create a new project" in the Start window. 
+3. Choose `C#` from the Language list.
+4. Choose `Windows` from the platform list.
+5. Choose `Console` from the project types list.
+6. Once your new project loads, you can add `.cs` files or edit the existing automatically-included `.cs` file.
+
+## ✏️ Popular C# IDEs/Editors
+
+- [Visual Studio Code](https://code.visualstudio.com/download)
+- [Visual Studio](https://visualstudio.microsoft.com/downloads)
+- [JetBrains Rider](https://www.jetbrains.com/rider)
+
+## 🆒 Some cool projects in C#
+
+- [The Roslyn .NET compiler](https://github.com/dotnet/roslyn)
+- [Google's Material Design for C#](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit)
+- [TheAlgorithms/C#](https://github.com/TheAlgorithms/C-Sharp)
+
+## 🚀 Conclusion
+
+C# is a very flexible and beginner-friendly language, and it's used in a multitude of contexts from the web to desktop to mobile gaming. It's not difficult to get started with C#, and it will allow you to create a wide variety of projects and applications. Sky's the limit!
+
+**Thanks for reading ✨**