feat: add readme for polywrap-plugin

Author: Niraj-Kamdar

packages/polywrap-plugin/README.md

@@ -0,0 +1,36 @@
+# polywrap-wasm
+
+Python implementation of the plugin wrapper runtime.
+
+## Usage
+
+### Invoke Plugin Wrapper
+
+```python
+from typing import Any, Dict, List, Union, Optional
+from polywrap_manifest import AnyWrapManifest
+from polywrap_plugin import PluginModule
+from polywrap_core import Invoker, Uri, InvokerOptions, UriPackageOrWrapper, Env
+
+class GreetingModule(PluginModule[None]):
+    def __init__(self, config: None):
+        super().__init__(config)
+
+    def greeting(self, args: Dict[str, Any], client: Invoker[UriPackageOrWrapper], env: Optional[Env] = None):
+        return f"Greetings from: {args['name']}"
+
+manifest = cast(AnyWrapManifest, {})
+wrapper = PluginWrapper(greeting_module, manifest)
+args = {
+    "name": "Joe"
+}
+options: InvokeOptions[UriPackageOrWrapper] = InvokeOptions(
+    uri=Uri.from_str("ens/greeting.eth"),
+    method="greeting",
+    args=args
+)
+invoker: Invoker = ...
+
+result = await wrapper.invoke(options, invoker)
+assert result, "Greetings from: Joe"
+```