docs: add information on using parsers with purego

Co-authored-by: Amaan Qureshi <[email protected]>

Author: topi314

Diff for: README.md

@@ -49,8 +49,37 @@ In the example above, to fetch the JavaScript grammar, you can run the following
 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.
+Alternatively you can also load grammars at runtime from a shared library via [purego](https://github.com/ebitengine/purego).
+
+The example below shows how to load the JavaScript grammar from a shared library (`libtree-sitter-PARSER_NAME.so`) at runtime on Linux & macOS:
+
+For more information on other platforms, see the [purego documentation](https://github.com/ebitengine/purego#supported-platforms)
+
+```go
+package main
+
+import (
+	tree_sitter "github.com/tree-sitter/go-tree-sitter"
+	"github.com/ebitengine/purego"
+)
+
+func main() {
+	path := "/path/to/your/parser.so"
+	lib, err := purego.Dlopen(path, purego.RTLD_NOW|purego.RTLD_GLOBAL)
+	if err != nil {
+        // handle error
+    }
+
+	var javascriptLanguage func() uintptr
+	purego.RegisterLibFunc(&javascriptLanguage, lib, "tree_sitter_javascript")
+
+	language := tree_sitter.NewLanguage(unsafe.Pointer(javascriptLanguage()))
+}
+```
+
+> [!NOTE]
+> 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).