add p3 CLI example (#202)

* add p3 CLI example

Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>

* refer to WASI repo

Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>

---------

Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>

Author: rvolosatovs

examples/cli-p3/README.md

@@ -0,0 +1,32 @@
+# Example: `cli-p3`
+
+This is an example of how to use [componentize-py] and [Wasmtime] to build and
+run a Python-based component targetting version `0.3.0-rc-2026-01-06` of the
+[wasi-cli] `command` world.
+
+[componentize-py]: https://github.com/bytecodealliance/componentize-py
+[Wasmtime]: https://github.com/bytecodealliance/wasmtime
+[wasi-cli]: https://github.com/WebAssembly/WASI/tree/v0.3.0-rc-2026-01-06/proposals/cli/wit-0.3.0-draft
+
+## Prerequisites
+
+* `Wasmtime` 41.0.3
+* `componentize-py` 0.21.0
+
+Below, we use [Rust](https://rustup.rs/)'s `cargo` to install `Wasmtime`.  If
+you don't have `cargo`, you can download and install from
+https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.3.
+
+```
+cargo install --version 41.0.3 wasmtime-cli
+pip install componentize-py==0.21.0
+```
+
+## Running the demo
+
+```
+componentize-py -d ../../wit -w wasi:cli/command@0.3.0-rc-2026-01-06 componentize app -o cli.wasm
+wasmtime run -Sp3 -Wcomponent-model-async cli.wasm
+```
+
+The `wasmtime run` command above should print "Hello, world!".

examples/cli-p3/app.py

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+from wit_world import exports
+
+class Run(exports.Run):
+    async def run(self):
+        print("Hello, world!")