docs: add README

README.md

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+# Go Tree-sitter
+
+[![CI][ci]](https://github.com/tree-sitter/py-tree-sitter/actions/workflows/ci.yml)
+[![Go version][version]](https://github.com/tree-sitter/go-tree-sitter/blob/master/go.mod)
+[![Version](https://img.shields.io/github/v/tag/tree-sitter/go-tree-sitter?label=version)](https://github.com/tree-sitter/go-tree-sitter/tags)
+[![Docs][docs]](https://pkg.go.dev/github.com/tree-sitter/go-tree-sitter)
+
+[ci]: https://img.shields.io/github/actions/workflow/status/tree-sitter/go-tree-sitter/ci.yml?logo=github&label=CI
+[version]: https://img.shields.io/github/go-mod/go-version/tree-sitter/go-tree-sitter
+[docs]: https://pkg.go.dev/badge/github.com/tree-sitter/go-tree-sitter.svg
+
+This repository contains Go bindings for the [Tree-sitter](https://tree-sitter.github.io/tree-sitter/) parsing library.
+
+To use this in your Go project, run:
+
+```shell
+go get github.com/tree-sitter/go-tree-sitter@latest
+```
+
+Example usage:
+
+```go
+package main
+
+import (
+    "fmt"
+
+    tree_sitter "github.com/tree-sitter/go-tree-sitter"
+    tree_sitter_javascript "github.com/tree-sitter/tree-sitter-javascript/bindings/go"
+)
+
+func main() {
+    code := []byte("const foo = 1 + 2")
+
+    parser := tree_sitter.NewParser()
+    defer parser.Close()
+    parser.SetLanguage(tree_sitter.NewLanguage(tree_sitter_javascript.Language()))
+
+    tree := parser.Parse(code, nil)
+    defer tree.Close()
+
+    root := tree.RootNode()
+    fmt.Println(root.ToSexp())
+}
+```
+
+By default, none of the grammars are included in this package.
+This way, you can only bring in what you need, but it's at the slight cost of having to call `go get` n times.
+
+In the example above, to fetch the JavaScript grammar, you can run the following:
+
+```shell
+go get github.com/tree-sitter/tree-sitter-javascript@latest
+```
+
+Due to [bugs with `runtime.SetFinalizer` and CGO](https://groups.google.com/g/golang-nuts/c/LIWj6Gl--es), you must always call `Close`
+on an object that allocates memory from C. This must be done for the `Parser`, `Tree`, `TreeCursor`, `Query`, `QueryCursor`, and `LookaheadIterator` objects.
+
+For more information, see the [documentation](https://pkg.go.dev/github.com/tree-sitter/go-tree-sitter).