Added Release 0.3.0 notes

- Bumped up release numbers in README
- Changed project status

Signed-off-by: Nisha K <[email protected]>

Added Release Notes for v0.2.0

See Release Notes for details on this release

Signed-off-by: Nisha K <[email protected]>

Added release notes for release 0.1.0

- Created new folder called 'releases' in docs to record release
notes
- Added v0_1_0.md release notes for v0.1.0
- Added link to release notes in README.md

Signed-off-by: Nisha K <[email protected]>