Write CHANGELOG.md, release 1.0

CHANGELOG.md

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+# Changelog
+
+## Version 1.0
+
+*March 27, 2017*
+
+[View Issues][v1.0-issues]
+
+**Features:**
+
+- Using CMake version 3.3
+- Installs LibWebRTC as a CMake package
+- Support for `gn`-based releases
+- Synchronize depot_tools with WebRTC's commit date
+- `TARGET_OS` and `TARGET_CPU` CMake config variables
+- `WEBRTC_REVISION` and `WEBRTC_BRANCH_HEAD` CMake config variables
+- x86 support under Windows
+- Better host OS and CPU architecture detection
+- pkg-config file generation
+- Deprecated shared library support
+- Debug mode support
+- .zip package for Windows, .tar.gz for Unix
+- Basic .deb and .rpm package generation
+
+**Fixes:**
+
+- Removed package.json and Jake support, focusing on CMake only
+- Refactored source code, removed Targets folder
+- Run commands with `cmake -E env`, no more Prefix File Trick
+- No more `merge_libs.py` call, use CMake to create the library
+- Removed the peer connection sample, wrote a little executable for tests
+- Removed FindLibWebRTC.cmake, defined CMake package files
+- Removed depot_tools git submodule
+- Retrieve the Linux sysroot before calling the generator
+- Removed support for releases older than January 1st, 2017 for now
+- Removed libwebrtc-chromium-deps repository
+- Wrote libwebrtc_execute macro
+- Created uninstall target
+- Removed BUILD_TESTS flag for now
+- Fixed static linking
+
+[v1.0-issues]:https://github.com/aisouard/libwebrtc/milestone/1