Add PR template

Author: Brinden Carlson

.github/pull_request_template.md

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+### Description 
+Please provide a detailed description of the changes this pull request introduces. If available, also link to a docdb link where the issue/change have been presented on/discussed.
+
+- [X] Have you added a label? (bug/enhancement/physics etc.)
+- [X] Have you assigned at least 1 reviewer?
+- [X] Is this PR related to an open issue / project?
+- [X] Does this PR affect CAF data format? If so, please assign a CAF maintainer as additional reviewer.
+- [X] Does this PR require merging another PR in a different repository (such as sbnanobj/sbnobj etc.)? If so, please link it in the description.
+- [X] Are you submitting this PR on behalf of someone else who made the code changes? If so, please mention them in the description.

.github/workflows/add_to_project.yaml

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+name: Auto Assign to Project(s)
+
+on:
+  issues:
+    types: [labeled]
+  pull_request:
+    types: [labeled]
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  MY_GITHUB_TOKEN: ${{ secrets.MY_GITHUB_TOKEN }}
+
+jobs:
+  assign_one_project:
+    runs-on: ubuntu-latest
+    name: Assign to One Project
+    steps:
+    - name: Assign issues and pull requests with `SBN-2020A_00` label to project 4
+      uses: srggrs/assign-one-project-github-action@1.2.0
+      if: |
+        contains(github.event.issue.labels.*.name, 'SBN-2020A_00') ||
+        contains(github.event.pull_request.labels.*.name, 'SBN-2020A_00')
+      with:
+        project: 'https://github.com/orgs/SBNSoftware/projects/4'
+        column_name: 'To Do'