Add docs on development

docs/src/development.md

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+# 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