Add README and gitignore

Author: mrtcnk

.gitignore

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+build/
+Testing/
+CMakeFiles/
+*.o
+*.a
+*.dylib
+*.so
+.DS_Store
+CMakeCache.txt
+cmake_install.cmake
+Makefile

README.md

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+# mpt-crypto
+
+This document outlines the mpt-crypto library, a cryptographic toolkit specifically designed to enable confidential Multi-Purpose Token (MPT) transactions on the XRP Ledger. 
+
+It details the implementation of core cryptographic primitives, including:
+* **ElGamal encryption** for confidential amounts.
+* **Schnorr-based zero-knowledge proofs** for equality and correct encryption.
+* **Bulletproofs** for efficient range proofs.
+
+All operations leverage the **libsecp256k1** framework. The library provides the foundational cryptographic operations necessary for managing private balances and ensuring the integrity of confidential ledger state transitions.