Prepare documentation for building a Python and WebAssembly libraries.

README.md

@@ -2,7 +2,7 @@
 
 Embed a small bit of code that converts between units of measure, e.g. Fahrenheit to Celsius.
 
-An example of a Rust library that is embeddable in Python and Web Assembly.
+An example of a Rust library that is embeddable in Python and WebAssembly.
 
 ##  Getting setup
 
@@ -11,15 +11,24 @@ Insure the following dependencies are in place:
 * Rust v1.32+ (nightly)
     * Install using `rustup toolchain install nightly`
     * Set default toolchain `rustup default nightly`
-* Python 3 Development headers (python3-dev in Ubuntu)
-* pipenv `pip install --user pipenv`
+* Python dependencies
+    * Python 3 Development headers `apt install python3-dev`
+    * pipenv `pip install --user pipenv`
+* WebAssembly
+    * [wasm-pack](https://rustwasm.github.io/wasm-pack/installer/)
+    * npm
 
 ## Running the Python example
 
 1. Build the rust crate first: `cargo build`
+1. Install dependencies and run in a virtualenv: `pipenv install && pipenv shell`
 1. Create the Python package with: `pyo3 develop`
 1. Run the tests: `pytest test.py`
 
+## Running the WebAssembly example
+
+TODO:
+
 ## Documentation
 
 * [PyO3 Python - Rust bindings](https://pyo3.rs/master/get_started.html)