Add changelog.

CHANGELOG.md

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+# CodeQL for Visual Studio Code: Changelog
+
+## 1.0.1 - 21 November 2019
+
+- Change `codeQL.cli.executablePath` to a per-machine setting, so it can no longer be set at the user or workspace level. This helps prevent arbitrary code execution when using a VS Code workspace from an untrusted source.
+- Improve the highlighting of the selected query result within the source code.
+- Improve the performance of switching between result tables in the CodeQL Query Results view.
+- Fix the automatic upgrading of CodeQL databases when using upgrade scripts from the workspace.
+- Allow removal of items from the CodeQL Query History view.
+
+
+## 1.0.0 - 14 November 2019
+
+Initial release of CodeQL for Visual Studio Code.