Add README (#32)

Author: bagel897

README.md

@@ -0,0 +1,58 @@
+# Pink
+
+This is a rewrite of the core of the [Codegen SDK](https://github.com/codegen-sh/codegen) in Rust.
+
+## Goals
+
+- Support more languages
+- Faster parse and execute time
+- More memory efficient
+- Incremental compilation
+
+## Structure
+
+- `codegen-sdk-common`: A crate that contains the common code for the SDK.
+- `codegen-sdk-cst`: Definitions and utilities for the CST.
+- `codegen-sdk-ast`: Definitions and utilities for the AST.
+- `codegen-sdk-cst-generator`: A crate that generates the CST for the SDK.
+- `codegen-sdk-ast-generator`: A crate that generates the AST and queries for the SDK. This requires the ts_query CST language to be generated first.
+- `languages/*`: A crate for each language that contains the language-specific code for the SDK. It's largely boilerplate, most of the work is done by the `codegen-sdk-ast-generator` and `codegen-sdk-cst-generator` crates. These are split out to make compiling the SDK faster.
+- `codegen-sdk-analyzer`: A crate that contains the core logic for the Incremenetal computation and state management of the SDK.
+- `src`: A base program that uses the SDK.
+
+## Development
+
+### Installing Rust
+
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup toolchain install nightly
+```
+
+### Installing tools
+
+```bash
+cargo install cargo-binstall -y
+cargo binstall cargo-nextest -y
+cargo binstall cargo-insta -y
+```
+
+### Building the project
+
+```bash
+cargo build
+```
+
+### Running tests
+
+```bash
+cargo insta run --workspace --review
+```
+
+Some of the tests use snapshots managed by [Insta](https://insta.rs/docs/cli/).
+
+### Running sample program
+
+```bash
+RUST_LOG=info cargo run --release /path/to/repo
+```