Create OpenUsages.md for libcrypto references

Added a new document listing open usages of libcrypto in various projects.

Author: Pymmdrza

docs/OpenUsages.md

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+# libcrypto - open usages on your code
+
+- LiteHuntRanger From `@Pymmdrza` in [LiteHuntRenger/litecoin_online_scanner.py](https://github.com/Pymmdrza/LiteHuntRanger/blob/mainx/litecoin_online_scanner.py)
+- Brain33 From `@Pymmdrza` in [Brain33/Brain33_V5.py](https://github.com/Pymmdrza/Brain33/blob/2de1b28922c3af8b1ac44e0d7989a6514a27221b/Brain33_V5.py)
+- RichWalletPrivateKeyFinder2 From `@Pymmdrza` in [RichWalletPrivateKeyFinder2/reth.py](https://github.com/Pymmdrza/RichWalletPrivateKeyFinder2/blob/71d6aa4ac82a34a2372a94e45898d297a34ad9b3/reth.py)