Add v2.0.0 release notes

release-notes.md

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+Adaptive-Scheduler v2.0.0 (beta) 🚀
+
+I am excited to announce the most significant update in 4 years for Adaptive-Scheduler.
+I have been working insane hours Friday and this weekend (I got too excited 😂) to get it ready.
+Adaptive-scheduder got to a state where I was afraid to make any changes, because there were no tests.
+So I added many tests, and now I am confident to make changes and add new features (which I did).
+
+I am looking for any beta testers!
+
+Key features and improvements:
+
+*   Native support for `concurrent.futuresProcessPoolExecutor`
+*   Function calls can now be submitted to workers ***without pickling***
+*   Fully typed code using mypy for better code quality and reliability
+*   Numerous bug fixes identified through tests and mypy
+*   Added an 391 tests, 100% testing coverage in core files
+*   Major code reorganization: **7243** line changes and **3632** new lines of code
+*   Removed `run_script.py` and templated code; replaced with a launcher script, simplifying job script creation
+*   Updated README.md and documentation
+
+Check out this crazy diff since the last release: https://github.com/basnijholt/adaptive-scheduler/compare/v1.8.0...main
+
+Note that I haven't tagged a new release yet, so you will need to install from the `main` branch, with:
+`pip install -U https://github.com/basnijholt/adaptive-scheduler/archive/refs/heads/main.zip`