Add Jupyter Lite serve instructions to the readme (#120)

Author: mcbarton

.github/workflows/main.yml

@@ -212,7 +212,7 @@ jobs:
           init-shell: >-
             ${{ matrix.micromamba_shell_init }}
           environment-name: xeus-cpp-wasm-build
-      
+
       - name: Setup default Build Type on *nux
         if: ${{ runner.os != 'windows' }}
         run: |

README.md

@@ -98,13 +98,18 @@ emcmake cmake \
 EMCC_CFLAGS='-sERROR_ON_UNDEFINED_SYMBOLS=0' emmake make install
 ```
 
-To test building Jupyter Lite with this kernel without creating a website you can execute the following
+To build Jupyter Lite with this kernel without creating a website you can execute the following
 ```bash
 micromamba create -n xeus-lite-host jupyterlite-core
 micromamba activate xeus-lite-host
 python -m pip install jupyterlite-xeus
 jupyter lite build --XeusAddon.prefix=$PREFIX
 ```
+Once the Jupyter Lite site has built you can test the website locally by executing
+```bash
+jupyter lite serve --XeusAddon.prefix=$PREFIX
+```
+
 
 ## Trying it online