docs(developer-guide): create ERB templates #5

1. User story: summary of expected behavior

⌦ Describe what you want to accomplish, in what role/capacity,
⌦ and why it's important to you.

As a potential contributor,
I want source code development guidelines
In order to increase the likelihood of contributing changes.

2. Acceptance criteria

We'll be done when:

• 1. A succinct README provides:
• 1.1. Recommended skills
• 1.2. Development software requirements
• 1.3. Source code retrieval instructions
• 1.4. Dependency installation and update instructions
• 1.5. Build instructions
• 1.6. Test execution instructions
• 1.7. Source code style guidelines
• 1.8. DevSecOps overview
• 2. A debugging doc with set up and execution instructions exists
• 3. A document with API design, security, and documentation guidelines exists
• 4. A document exists covering Architecture Decision Records (ADR): process, submission, and maintainer instructions
• 5. A copy of (or link to) Codacy's Software metrics: a practical guide for the curious developer PDF exists.

3. Notes

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