Add initial Changelog entries for packages (#474)

Author: nateprewitt

packages/aws-sdk-signers/CHANGES.md

@@ -0,0 +1,36 @@
+# Changelog
+
+## Unreleased
+
+### Features
+* Added AsyncEventSigner for Amazon Event Stream event signing.
+* Added new ``uri_encode_path`` parameter to SigV4SigningProperties.
+  This boolean can be toggled to double encode the URI path.
+
+### Bugfixes
+* Fixed bug with async seekable payloads on requests.
+* Fixed bug where paths were not being properly double-encoded.
+
+## 0.0.2
+
+### Feature
+* Added new ``content_checksum_enabled`` parameter to SigV4SigningProperties.
+
+  This will enable users to control the inclusion of the `X-Amz-Content-SHA256`
+  header required by S3. This is _disabled_ by default, so you will need to
+  set this to `True` for any S3 requests.
+
+### Bugfixes
+* Fixed incorrect exclusion of `X-Amz-Content-SHA256` header from some requests.
+
+## 0.0.1
+
+### Features
+* Added SigV4Signer to sign arbitrary requests sychronously.
+* Added AsyncSigV4Signer to sign arbitrary requests asychronously.
+* Added example SigV4Auth for integrating directly with Requests'
+  ``auth`` parameter.
+* Added SigV4Signer for integrating with the AIOHTTP request
+  workflow.
+* Added SigV4Curl for generating signed curl commands.
+

packages/smithy-aws-core/CHANGES.md

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+# Changelog
+
+## Unreleased
+
+### Feature
+* Added support for Instance Metadata Service (IMDS) credential resolution.
+* Added basic endpoint support.
+* Added basic User Agent support.
+* Added basic AWS specific protocol support for RestJson1 and HTTP bindings.

packages/smithy-aws-event-stream/CHANGES.md

@@ -1,4 +1,7 @@
+# Changelog
+
 ## Unreleased
+
 ### Features
 * Added basic support for the [Amazon Event Stream](https://smithy.io/2.0/aws/amazon-eventstream.html) specification.
 * Added support for unidirectdional and bidirectional event streams.

packages/smithy-core/CHANGES.md

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+# Changelog
+
+## Unreleased
+
+### Feature
+* Added support for minimal components required for SDK generation.

packages/smithy-http/CHANGES.md

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+# Changelog
+
+## Unreleased
+
+### Feature
+* Added support for aiohttp and AWSCRT http clients.
+* Added basic HTTP primitives and interfaces for Smithy clients.

packages/smithy-json/CHANGES.md

@@ -0,0 +1,6 @@
+# Changelog
+
+## Unreleased
+
+### Feature
+* Added support for json primitives in Smithy clients.