ICU-21824 add a basic CONTRIBUTING.md

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+# Contributing to ICU
+
+Thank you for wanting to contribute to ICU!
+
+Please see our instructions at <https://icu.unicode.org/processes/contribute>
+
+### License
+
+Please see [./icu4c/LICENSE](./icu4c/LICENSE) (C and J are under an identical license file.)
+
+> Copyright © 2021 and later Unicode, Inc. and others. All Rights Reserved.
+Unicode and the Unicode Logo are registered trademarks
+of Unicode, Inc. in the U.S. and other countries.
+[Terms of Use and License](http://www.unicode.org/copyright.html)