Issue templates (#687)

* Issue templates

* Require full conda list

Co-authored-by: Adam Urbańczyk <[email protected]>

Author: marcus7070

.github/ISSUE_TEMPLATE/00-generic-issue.md

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+---
+name: Generic issue
+about: Use this if none of the more specific templates fit your issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- If you have a question, please first make sure it is not already answered in the README.md or https://cadquery.readthedocs.io -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Online documentation
+    url: https://cadquery.readthedocs.io/
+    about: CadQuery's extensive online documentation
+  - name: Discord channel
+    url: https://discord.gg/qz3uAdF
+    about: For more casual discussion and help
+  - name: Google group
+    url: https://groups.google.com/forum/#!forum/cadquery
+    about: Mailing list for CadQuery

.github/ISSUE_TEMPLATE/exception_crash_report.md

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+---
+name: Exception/crash report
+about: You have a specific exception or crash to report
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- Bug reports that are not about a specific exception or crash are also welcome, feel free to use the generic issue template instead. -->
+<!-- This template is just a suggestion, it does not have to be followed exactly. -->
+
+## To Reproduce
+
+<!-- If possible, please give a minimal example that triggers the error. -->
+```python
+```
+
+<!-- Screenshots of the model prior to the error are often helpful. -->
+
+## Backtrace
+
+<!-- Backtraces from CQ-editor's GUI can often be shortened. We prefer a full backtrace from running your code as a script in the Python interpreter. -->
+```
+```
+
+## Environment
+
+OS:
+
+Was CadQuery installed using Conda?: <!-- Note Conda is the only official installation method. If you are not using Conda, please provide details of your build/install/packaging methods, since they are often relevant to bugs and crashes. -->
+Output of `conda list` from your active Conda environment:
+```
+```
+
+Using: <!-- CQ-Editor, Jupyter Notebook, Python interpreter, cq-cli or something else? -->

.github/ISSUE_TEMPLATE/modelling-question.md

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+---
+name: Modelling question
+about: You want to know how to perform a modelling operation
+title: ''
+labels: question
+assignees: ''
+
+---
+
+<!-- Questions that are not answered in
+
+* [our README.md](https://github.com/CadQuery/cadquery/blob/master/README.md)
+* [online docs](https://cadquery.readthedocs.io/en/latest/)
+* previous issues
+
+are appreciated.
+
+If you want to discuss something in a more casual environment, we have other options under [Getting help in the README.md](https://github.com/CadQuery/cadquery#getting-help). There are also additional examples in the [cadquery-contrib repository](https://github.com/CadQuery/cadquery-contrib).
+-->
+
+<!-- We are all volunteers here, you can help us help you by making this question quick to answer. Minimal examples, trimmed of all unreleated code are appreciated. It also helps if you provide code that can be cut and pasted into CQ-Editor. ie. instead of:
+
+> I have a box, how to I fillet a top corner?
+
+we would prefer:
+
+> ```python
+> w0 = (
+>     cq.Workplane()
+>     .box(1, 1, 1)
+> )
+> ```
+> How do I fillet a single corner?
+
+-->

.github/ISSUE_TEMPLATE/occt-feature-request.md

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+---
+name: OCCT feature request
+about: Suggest an implementation of an existing OCCT feature
+title: ''
+labels: OCC feature, enhancement
+assignees: ''
+
+---
+
+<!-- Describe what use cases this would have and any other relevant information. -->
+
+Links to OCCT documentation:
+*  <!-- https://old.opencascade.com/doc/occt-7.5.0/refman/html/ -->