docs: add README & License

Author: charmful0x

LICENSE

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+MIT License
+
+Copyright (c) 2024 WVM
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-# exex-templates
+<p align="center">
+  <a href="https://wvm.dev">
+    <img src="https://raw.githubusercontent.com/weaveVM/.github/main/profile/bg.png" alt="WeaveVM">
+  </a>
+</p>
+
+## About
+This repository contains a collection of Execution Extensions (ExExes) developed by the [WeaveVM](https://wvm.dev) team. These ExExes are designed to be general-purpose tools and serve as public goods for the [Reth community](https://reth.rs). For more details and examples, visit [exex.rs](https://exex.rs).
+
+## Available Templates
+
+- [exex-wvm-bigquery](./templates/exex-wvm-bigquery/): An ETL pipeline to store Reth block data in JSON format in BigQuery. Works for any Reth node.
+  
+- [exex-wvm-da](./templates/exex-wvm-da/): Provides an interface for WeaveVM longterm DA in any Reth client, with less than 80 lines of code.
+
+## License
+The ExExes in this repository are licensed under the [MIT License](./LICENSE).