use NWX CI image; additions to READEM

.github/workflows/pull_request.yaml

@@ -23,15 +23,21 @@ on:
 jobs:
   Test-Cookiecutter:
     runs-on: ubuntu-latest
+    container: 
+      image: ghcr.io/nwchemex/nwx_buildenv:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.CONTAINER_REPO_TOKEN }}
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-        with:
-          python-version: '3.x'
       - name: Install cookecutter
         run: |
           pip install cookiecutter
         shell: bash
+      - name: Install Zip
+        run: |
+          apt-get update && apt-get install zip
+        shell: bash
       - name: Zip current state
         run: |
           # From the Cookiecutter docs

README.md

@@ -27,7 +27,11 @@ will contain the following:
 
 These files constitute a bare plugin library and a simple test for the 
 `load_modules` function. New modules and property types can be added and
-registered following the [PluginPlay tutorials](https://nwchemex.github.io/PluginPlay/tutorials/index.html).You can configure, build, and test the new plugin as follows:
+registered following the [PluginPlay tutorials](https://nwchemex.github.io/PluginPlay/tutorials/index.html).
+The resulting library will depend on [SimDE](https://github.com/NWChemEx/SimDE).
+See [here](https://nwchemex.github.io/SimDE/install.html#simde-dependencies) for
+the further info on SimDE's dependencies. You can configure, build, and test the
+new plugin as follows:
 
 ```bash
 $ cmake -Bbuild -H. -DCMAKE_TOOLCHAIN_FILE=./default_toolchain.cmake -DCMAKE_INSTALL_PREFIX=./install