issue and pr templates (#203)

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: Submit a bug report
+title: "[Bug Report] Bug title"
+
+---
+
+If you are submitting a bug report, please fill in the following details and use the tag [bug].
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Code example**
+Please try to provide a minimal example to reproduce the bug. Error messages and stack traces are also helpful.
+
+**System Info**
+Describe the characteristic of your environment:
+ * Describe how `transformer_lens` was installed (pip, docker, source, ...)
+ * What OS are you using? (Linux, MacOS, Windows) 
+ * Python version (We suppourt 3.7 -3.10 currently)
+
+**Additional context**
+Add any other context about the problem here.
+
+### Checklist
+
+- [ ] I have checked that there is no similar [issue](https://github.com/neelnanda-io/TransformerLens/issues) in the repo (**required**)

.github/ISSUE_TEMPLATE/proposal.md

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+---
+name: Proposal
+about: Propose changes that are not fixes bugs
+title: "[Proposal] Proposal title"
+---
+
+### Proposal 
+
+A clear and concise description of the proposal.
+
+### Motivation
+
+Please outline the motivation for the proposal.
+Is your feature request related to a problem? e.g.,"I'm always frustrated when [...]".
+If this is related to another GitHub issue, please link here too.
+
+### Pitch
+
+A clear and concise description of what you want to happen. It is useful if you relate proposals to existing features or lackthereof as well as relevant mechanistic interpretability techniques or model architectures.
+
+### Alternatives
+
+A clear and concise description of any alternative solutions or features you've considered, if any.
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.
+
+### Checklist
+
+- [ ] I have checked that there is no similar [issue](https://github.com/Farama-Foundation/MiniGrid/issues) in the repo (**required**)

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+title: "[Question] Question title"
+---
+
+
+### Question
+
+If you're a beginner and have basic questions, you can ask them on various online forums such as:
+- The [Open Source Mechanistic Interpretability Slack](https://join.slack.com/t/opensourcemechanistic/shared_invite/zt-1qosyh8g3-9bF3gamhLNJiqCL_QqLFrA)
+- The [Eleuther AI discord](https://discord.gg/zBGx3azzUn)
+- The [Mechanistic Interpretability Discord](https://discord.gg/wcuV4xnJ)
+
+Advanced/nontrivial questions, especially in areas where documentation is lacking, are very much welcome here.

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+### Screenshots
+Please attach before and after screenshots of the change if applicable.
+
+<!--
+Example:
+
+| Before | After |
+| ------ | ----- |
+| _gif/png before_ | _gif/png after_ |
+
+
+To upload images to a PR -- simply drag and drop an image while in edit mode and it should upload the image directly. You can then paste that source into the above before/after sections.
+-->
+
+# Checklist:
+
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have not rewritten tests relating to key interfaces which would affect backward compatibility
+
+<!--
+As you go through the checklist above, you can mark something as done by putting an x character in it
+
+For example,
+- [x] I have done this task
+- [ ] I have not done this task
+-->