Add Release notes on v2.0.0

RELEASE_NOTES.md

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+# Release Notes v2.0.0 (Dec 16 2024)
+
+This the first release for Greengrass nucleus lite product line. Greengrass
+nucleus lite v2 aims to be compatable with AWS's GreenGrass v2(GGV2) product
+line, however currently only subset of the features are supported with this
+release.
+
+## Installing from sources
+
+To install nucleus lite from source, please follow the guide from
+[SETUP.md](./docs/SETUP.md) and [TES.md](./docs/TES.md), once the setup
+environment is complete, please start refering to
+[INSTALL.md](./docs/INSTALL.md) file.
+
+> For developers planning to contribute to nucleus lite, it's highly recommended
+> to setup a nix environment, more information on setup can be found
+> [here](./docs/DEVELOPMENT.md).
+
+For those intrested in a generic method of provisioning nucleus lite device,
+fleet provisioning by claim may be one of the appropriate solution to the
+problem. Please refer to fleet provisioning setup guide
+[here](./docs/Fleet-provisioning.md).
+
+## New with this release
+
+To provide more transparency on decisions and be in sync with the community all
+the design docs and specs for the project are now provided with this release.
+You can find more details on the [design doc](./docs/design/) and
+[spec doc](./docs/spec/) by following the corresponding links.
+
+As mentioned at the start, currently nucleus lite isn't fully compatable with
+GGV2. The plan is to release this initail version of nucleus lite with basic
+feature support first and then gain full feature compatibility with future
+releases. Currently only basic recipe types are supported and inforation on the
+supported recipe can be found here [here](./docs/RECIPE_SUPPORT_CHANGES.md).
+
+Furthermore there are known difference in behavior that are outlined by
+[KNOWN_ISSUES](./docs/KNOWN_ISSUES.md) document. Also please look at the Github
+issues section to keep up with latest known issues. It's encouraged to open up a
+Github issues for any behaviors that is noticed by the contributors but not
+coverted by the doc or Github issues.