Prep for additional contributors issue #6

  Minimal instructions for contributions.
  Provide default structure for feature issues.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Feature or change proposal for project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Desired State
+A clear and concise description of what you want to happen or the end result.
+
+## Context
+A brief description of the current state or rationale for proposing the feature.  E.g. a problem or pain point with the project.

contributing.md

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+# Contributing
+
+## Contributing Code/Features/Bug Fixes
+The work on this project roughly follows [git flow](https://datasift.github.io/gitflow/IntroducingGitFlow.html), but without a bugfix or release branch.
+In short, work is laid out in an issue, done in a feature branch, tested in the develop branch, and finally added to the main branch.
+
+1. Make an issue
+    - Describe the feature or change
+    - Explain the rationale
+    - Watch the thread for replies and discussion
+1. Make a branch
+    - Do work on this branch
+    - Add tests that demonstrate/exercise the expected code use
+    - Add tests that illustrate expected/known edge cases
+1. Create pull request (PR) against develop branch
+    - Squash commits into single or few related chunks of work.
+    - Watch the PR thread for replies and discussion
+    - Watch the PR for continuous integration results
+
+### Commits
+Commit messages: 
+
+- Written in present tense.
+- Answers the question "why?" the code
+
+### Formatting and Linting
+For c++ code, use clang-lint and clang-format from LLVM. Configuration will be included in project files.
+[](https://github.com/llvm/llvm-project/releases/tag/llvmorg-17.0.5)
+
+For python code, use flake8.