Initial attempt at PR and Issue templates (#351)

* Initial attempt at PR and Issue templates

Signed-off-by: John Kjell <john@testifysec.com>

* Address some review feedback

Signed-off-by: John Kjell <john@testifysec.com>

---------

Signed-off-by: John Kjell <john@testifysec.com>
Co-authored-by: Tom Meadows <tom@tmlabs.co.uk>

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: '[Bug]: '
+labels: ['bug', triage']
+assignees: ''
+---
+
+**What steps did you take and what happened:**
+
+[A clear and concise description of what the bug is.]
+
+**What did you expect to happen:**
+
+[Expected outcome listed here.]
+
+**Anything else you would like to add:**
+
+[Miscellaneous information that will assist in solving the issue.]
+
+**Environment:**
+
+- Witness version:
+- Architecture:
+- Attestors used:
+- Archivista version:

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: '[Feat]: '
+labels: ['feature', 'triage']
+assignees: ''
+
+---
+
+**Describe the solution you'd like:**
+
+[A clear and concise description of what you want to happen.]
+
+**User value:**
+
+[Why will this feature be valuable to you? Why will this be valuable to others?]
+
+**Expected behavior:**
+
+[What would you like to see happen]
+
+**Proposed solution:**
+
+[If you're able, describe possible solution workflow]
+
+**Anything else you would like to add:**
+
+[Miscellaneous information that will assist in solving the issue.]
+
+**Testing changes required:**
+
+[List possible testing changes required, if none please explain, if unsure assignee will assist]
+
+**Documentation changes required:**
+
+[List possible documentation changes required, if none please explain, if unsure assignee will assist]

.github/PULL_REQUEST_TEMPLATE.md

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+## What this PR does / why we need it
+
+Description
+
+## Which issue(s) this PR fixes (optional)
+
+(optional, using `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when the PR gets merged)*
+
+Fixes #
+
+## Acceptance Criteria Met
+
+- [ ] Docs changes if needed
+- [ ] Testing changes if needed
+- [ ] All workflow checks passing (automatically enforced)
+- [ ] All review conversations resolved (automatically enforced)
+- [ ] [DCO Sign-off](https://github.com/apps/dco)
+
+**Special notes for your reviewer**: