Add docs on development

docs/src/development.md

@@ -0,0 +1,31 @@
+# Developing Pinry
+
+Pinry currently has two major requirements:
+
+- Python 3.6+
+- Node 10+
+
+For minor requirements you need two have installed two package managers that
+are not the defaults for these languages:
+
+- Python, pipenv
+- Node, yarn
+
+To install these is pretty simple, you can just run:
+
+    pip install pipenv
+    npm install -g yarn
+
+After that you can install this project with:
+
+    pipenv install --dev
+    cd pinry-spa; yarn install
+
+You will need to run two separate items as of right now, the SPA and the
+backend:
+
+    pipenv run python manage.py
+
+And from another terminal:
+
+    cd pinry-spa; yarn serve

mkdocs.yml

@@ -17,6 +17,7 @@ nav:
   - Screenshots: 'screenshots.md'
   - Extensions: 'extensions.md'
   - Theories: 'theories.md'
+  - Development: 'development.md'
   - Docs: 'docs.md'
   - Passwords: 'passwords.md'
   - Assets: 'assets.md'