Add github templates (#5335)

* Add github templates

* update language

* cleanup

* Add blocks for details output

* clean up verbiage

* clean up verbiage

* clean up verbiage

* clean up verbiage

* clean up verbiage

* clean up verbiage

* clean up verbiage

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+Hi! Thanks for using JupyterLab.
+
+If you are reporting an issue with JupyterLab, please use the [GitHub issue](https://github.com/jupyterlab/jupyterlab/issues) search feature to check if your issue has been asked already. If it has, please add your comments to the existing issue.
+
+The JupyterLab team and Project Jupyter value our community, and JupyterLab
+follows the Jupyter [Community Guides](https://jupyter.readthedocs.io/en/latest/community/content-community.html).
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+
+- OS: [e.g. Windows 10]
+- Browser [e.g. chrome 69.0, firefox 62.0]
+- JupyterLab [e.g. 0.34.2]
+
+**Additional context**
+Add any other context about the problem here.
+
+If available, please include the following details:
+
+<details><summary>Troubleshoot Output</summary>
+<pre>
+Paste the output from running `jupyter troubleshoot` from the command line here.
+You may want to sanitize the paths in the output.
+</pre>
+</details>
+
+<details><summary>Command Line Output</summary>
+<pre>
+Paste the output from your command line running `jupyter lab` here, use `--debug` if possible.
+</pre>
+</details>
+
+<details><summary>Browser Output</summary>
+<pre>
+Paste the output from your browser console here.
+</pre>
+</details>

.github/ISSUE_TEMPLATE/installation-and-configuration-issues.md

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+---
+name: Installation and configuration issues
+about: Installation and configuration assistance
+---
+
+If you are having issues with installation or configuration, you may ask for help on the [JupyterLab Gitter channel](https://gitter.im/jupyterlab/jupyterlab) or file an issue here.

.github/pull_request_template.md

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+Fixes #
+
+**Screenshots**
+If applicable, add before and after screenshots to help show the issue being fixed, or the appearance of a new feature.