Create README.md

Author: pawanjay176

README.md

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+# Rustic Builder
+
+## Overview
+
+A simple mock builder implementation that serves local mempool transactions from an Ethereum node through the Builder API flow.
+It works as a wrapper over Lighthouse's [mock-builder](https://github.com/sigp/lighthouse/blob/unstable/beacon_node/execution_layer/src/test_utils/mock_builder.rs) which is used for lighthouse tests. This means that as Lighthouse implements support for new forks, the builder automatically gets support for the fork by just pointing it to the right lighthouse commit.
+
+The name references both its implementation language (Rust) and its rustic nature - serving farm-to-table payloads from your local execution client.
+
+## Installation
+
+```
+cargo build --release
+```
+
+## Usage
+
+Needs a fully synced ethereum node (Beacon node + Execution client)
+
+Example usage
+```
+./target/release/rustic-builder --execution-endpoint http://localhost:8551 --beacon-node http://localhost:5052 --jwt-secret jwt.hex --port 8560
+```