Add Changelog and releasing files

Author: f2prateek

CHANGELOG.md

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+# Changelog
+
+### Version 0.1.0 *(in progress)*
+* Initial Release

RELEASING.md

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+# Releasing
+
+1. Verify the build by running `make build test docker`.
+2. Update the version in `README.md`.
+3. Update the `CHANGELOG.md` for the impending release.
+4. Run `git commit -am "Prepare for release X.Y.Z."` (where X.Y.Z is the new version).
+5. Run `git tag -a X.Y.Z -m "Version X.Y.Z"` (where X.Y.Z is the new version).
+6. Run `git push && git push --tags`.
+7. Run `make docker-push`.
+8. Run `github-release upload --user segmentio --repo segment-proxy --tag X.Y.Z --name "X.Y.Z" --file in/segment-proxy`.