add readme

Author: fangting-alchemy

README.md

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+# ERC-6900 Ref Implementation
+
+Reference implementation for [ERC-6900](https://eips.ethereum.org/EIPS/eip-6900). It is an early draft implementation.
+
+The implementation includes an upgradable modular account with two plugins (`SingleOwnerPlugin` and `TokenReceiverPlugin`). It is compliant with ERC-6900 with the latest updates.
+
+## Caveat
+
+- **_Not audited and should not be used in production_**.
+- Not optimized in both deployments and execution.
+- Lack support for easy account states building. It is possible off-chain, but not easy.
+
+## Development
+
+Anyone is welcome to submit feedback and/or PRs to improve code or add Plugins.
+
+### Build
+
+```bash
+forge build
+
+# or use the lite profile to reduce compilation time
+FOUNDRY_PROFILE=lite forge build
+```
+
+### Test
+
+```bash
+forge test -vvv
+
+# or use the lite profile to reduce compilation time
+FOUNDRY_PROFILE=lite forge test -vvv
+```