Add advice for developers section
This is a long document that risks not being read by the people who should read it most, developers. I suggest adding a short section at the top of the document.
Advice for Developers
Open sourcing your code is a great idea, it helps contribute back to the community, as well as improves your own codebase from contributions from the community. Additionally it lets you become part of the wider open source ecosystem which helps share modern ideas and tools to develop some really cool stuff. Many government agencies are already on board. You should aim to have your code open source by default.
Open sourcing your code involves creating a repository on a public platform like Github or Bitbucket. The most important thing to add to your repository is a README file with an overview of what your code does, and your License (see section 13).