Add a readme

Author: sangbida

simln-lib/README.md

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+# sim-ln
+
+A Lightning Network simulation library that enables testing and analysis of payment routing behavior in a controlled environment.
+
+## Overview
+
+sim-ln provides a framework for simulating Lightning Network payment routing behavior, allowing developers and researchers to:
+
+- Create simulated Lightning Network topologies
+- Test payment routing strategies
+- Analyze network behavior under different conditions
+- Simulate real Lightning node implementations (LND, c-lightning, Eclair)
+