Adds issue and pull request templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug/Crash report but not related to a third party API (see other options below)
+about: Report a bug in the codebase or a crash
+labels:
+---
+<!--
+Thank you for filing a bug report! 🐛 Please provide a short summary of the bug,
+along with any information you feel relevant to replicating the bug. Always try to
+provide the data you used in your example as otherwise it can be difficult to
+reporduce the bug.
+-->
+
+## Description
+I tried this code:
+
+```
+<code>
+```
+
+I expected to see this happen: *explanation*
+
+Instead, this happened: *explanation*
+
+Here is a link to download the data I used:
+
+## Metadata
+- WhiteboxTools version:
+- API used if (Python, R, QGIS, ArcMap):
+- Operating System version:
+
+*Note that WhiteboxTools Open Core (WbTOC) and Whitebox Workflows for Python (WbW) are not the same software. Only WhiteboxTools Open Core is available in this repository.*

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+  - name: WhiteboxTools Google Group
+    url: https://groups.google.com/g/whiteboxtools
+    about: Ask and answer questions about Whitebox tools here.
+
+  - name: WhiteboxTools on GIS StackExchange
+    url: https://gis.stackexchange.com/questions/tagged/whitebox-tools
+    about: Ask and answer questions about Whitebox tools here.
+
+  - name: ArcGIS plugin
+    url: https://github.com/giswqs/WhiteboxTools-ArcGIS/issues
+    about: Report an issue with the ArcGIS plugin.
+
+  - name: R package
+    url: https://github.com/giswqs/whiteboxR/issues
+    about: Report an issue with the R package.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request for a new feature to be added
+labels: feature request
+---
+
+## Request
+<!--
+Provide details about what you are looking for.
+
+See [How do I request a tool to be added?](https://www.whiteboxgeo.com/manual/wbt_book/faq.html#how-do-i-request-a-tool-be-added) if you are looking for tools from Whitebox GAT.
+See [How does WhiteboxTools' design philosophy differ?](https://www.whiteboxgeo.com/manual/wbt_book/faq.html#how-does-whiteboxtools-design-philosophy-differ) to learn more about why WhiteboxTools is the way it is.
+-->
+
+## Drawbacks
+<!--Does this new feature will cause any issue with other parts of WhiteboxTools?-->
+
+## Usage example
+<!--In which situation would it be useful?-->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Related issue
+<!--- This project only accepts pull requests related to open issues -->
+<!--- If suggesting a new feature or change, please discuss it in an issue first -->
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+## Motivation and context
+<!--- Why is this change required? What problem does it solve? -->
+
+## How has this been tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Screenshots (if appropriate):