create pull request template

Author: chakravala

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: [chakravala]
+patreon: dreamscatter
+liberapay: chakravala
+open_collective: grassmannjl
+ko_fi: # Replace with a single Ko-fi username
+tidelift: "julia/Grassmann"
+otechie: # Replace with a single Otechie username
+custom: https://music.crucialflow.com

.github/pull_request_template.md

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+**Type of pull request**
+Grammar fixes don't require any further explanation.
+Documentation extensions or examples require justification.
+Bug fixes require inclusion of or reference to bug report.
+New features require justification and desired goals.
+
+**Describe the feature**
+A clear and concise description of what the feature is.
+Describe the changes proposed in the pull request.
+Reference any related issue in repository.
+
+**To Reproduce**
+Steps to reproduce the desired behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment:** (if necessary)
+ - OS: [e.g. GNU/Linux/OSX/Windows]
+ - Version [e.g. Julia v1.4, Grassmann v0.5.7]
+
+**Additional context**
+Add any other context about the problem here.