doc: bootstrap generic documentation

Author: manusa

README.md

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+# WebAssembly (WASM) - WASI playground
+
+## Container images
+
+### JavaScript
+
+See the specific [README.md](./javascript/README.md) for more details about the container image and how it's built.
+
+
+### Running the images
+
+#### Podman
+
+[Podman](https://github.com/containers/podman) supports running wasi/wasm OCI container images through [crun](https://github.com/containers/crun).
+
+Requirements:
+- crun
+- crun-wasm
+
+```bash
+podman run -it --rm --platform=wasi/wasm marcnuri/hello-world-of-wasm:js
+```
+
+#### Docker Desktop