Add standard template for creating PRs

[shahbazn]

Description

Recently while updating test net k8s cluster a recently added API endpoint was skipped from testing because DevOps team was not aware of the new endpoint and an issue with this endpoint on new cluster was only caught after we moved the test net to new cluster. To avoid this in the future this PR adds a standard PR template to delegate dependencies whenever applicable.

Feature Status

READY

Related PRs

Repo/Branch	PR
bigchaindb/bigchaindb	link

Todos

• [x] Documented in CONTRIBUTING.rst
• [ ] Reviewed and approved by a senior dev

Deployment Notes

No impact on deployment

How to QA

Create a new PR and the template should be visible

Impacted Areas in Application

• No Scale impact
• No Performance impact
• No Security impact
• Documentation impact: Developer documentation needs to be updated

[codecov-io]

Codecov Report

Merging #329 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #329   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files           9        9           
  Lines         236      236           
=======================================
  Hits          234      234           
  Misses          2        2