feat: resurrect CONTRIBUTIONS.md (#3)

CONTRIBUTIONS.md

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+# Notable Contributions
+
+Notable contributions of fixes/features/refactors:
+
+- [208](https://github.com/gnolang/gno/pull/208) - @anarcher, gnodev test with testing.T
+- [#167](https://github.com/gnolang/gno/pull/167) - @loicttn, website: Add syntax highlighting + security practices
+- [#136](https://github.com/gnolang/gno/pull/136) - @moul, foo20, a grc20 example smart contract
+- [#126](https://github.com/gnolang/gno/pull/126) - @moul, feat: use the new Precompile in gnodev and in the addpkg/execution flow (2/2)
+- [#119](https://github.com/gnolang/gno/pull/119) - @moul, add a Gno2Go precompiler (1/2)
+- [#112](https://github.com/gnolang/gno/pull/112) - @moul, feat: add 'gnokey maketx --broadcast' option
+- [#110](https://github.com/gnolang/gno/pull/110), [#109](https://github.com/gnolang/gno/pull/109), [#108](https://github.com/gnolang/gno/pull/108), [#106](https://github.com/gnolang/gno/pull/106), [#103](https://github.com/gnolang/gno/pull/103), [#102](https://github.com/gnolang/gno/pull/102), [#101](https://github.com/gnolang/gno/pull/101) - @moul, various chores.