Adding CHANGELOG file to track release changes

Author: daviwil

CHANGELOG.md

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+# vscode-powershell Release History
+
+## 0.2.0
+### Friday, November 20, 2015
+
+- Added a new online help command!  Press Ctrl+F1 to get help for the symbol under the cursor.
+- Enabled PowerShell language features for untitled and in-memory (e.g. in Git diff viewer) PowerShell files
+- Added `powershell.scriptAnalysis.enable` configuration variable to allow disabling script analysis for performance (issue #11)
+- Fixed issue where user's custom PowerShell snippets did not show up
+- Fixed high CPU usage when completing or hovering over an application path
+
+## 0.1.0
+### Wednesday, November 18, 2015
+
+Initial release with the following features:
+
+- Syntax highlighting
+- Code snippets
+- IntelliSense for cmdlets and more
+- Rule-based analysis provided by PowerShell Script Analyzer
+- Go to Definition of cmdlets and variables
+- Find References of cmdlets and variables
+- Document and workspace symbol discovery
+- Local script debugging and basic interactive console support