Add readme

Author: febo

Diff for: interface/README.md

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+<p align="center">
+  <a href="https://solana.com">
+    <img alt="Solana" src="https://github.com/user-attachments/assets/534af75d-6347-48dc-8943-129423b2ba63" height="80" />
+  </a>
+</p>
+
+# SPL Token Interface
+
+This crate contains instructions and constructors for interacting with the [SPL Token program](https://spl.solana.com/token).
+
+The Token program defines a common implementation for Fungible and Non Fungible tokens.
+
+## Getting Started
+
+From your project folder:
+
+```bash
+cargo add spl-token-interface
+```
+
+This will add the `spl-token-interface` dependency to your `Cargo.toml` file.
+
+## Documentation
+
+Read more about the Stake program on the crate [documentation](https://docs.rs/spl-token-interface/latest/spl_token_interface/).

Diff for: p-token/README.md

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 # `p-token`
 
 A `pinocchio`-based Token program.
+
+## Overview
+
+`p-token` is a reimplementation of the SPL Token program, one of the most popular programs on Solana, using [`pinocchio`](https://github.com/anza-xyz/pinocchio). The purpose is to have an implementation that optimizes the compute units, while being fully compatible with the original implementation — i.e., support the exact same instruction and account layouts as SPL Token, byte for byte.
+
+## Features
+
+- `no_std` crate
+- Same instruction and account layout as SPL Token
+- Minimal CU usage
+
+
+## License
+
+The code is licensed under the [Apache License Version 2.0](LICENSE)