Issue/documentation update

[TheDanMiller]

Contributing doc

Summary

Seeds some images for the technical volume and jams in a contribution update Relats to #135

Type of change

• [x] This is a documentation update

How To Test

1. Read document

Checklist:

• [ ] My code follows the style guidelines of this project and has no linting errors
• [x] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation, including any applicable ADRs
• [x] My changes generate no new warnings
• [ ] I have added tests that fail without these changes
• [ ] New and existing tests (unit, integration, accessibility) pass locally
• [x] Documentation updated
• [ ] If there are security concerns they are addressed or ticketed after being discussed

[codeclimate[bot]]

Code Climate has analyzed commit 785a88f0 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 95.4% (0.0% change).

View more on Code Climate.