Init issue templates for bug reports and feature requests

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Possible bug] name_your_feature_request"
+labels: bug
+assignees: nkaskov
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+How to reproduce the behavior:
+1. Code snippet (if it is small)
+2. Link to a public repository (if the code is too big)
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Toolchain versions**
+1. If you have built `zkllvm` from source - give us the commit you are on in `zkllvm` repository and in its submodules `assigner` and `circifier`. They are being updated quite often and might be outdated on the local setup.
+2. If you are using a binary version - please provide the result of the following command:
+`assigner --version`
+
+
+**Backtrace**
+If you have the backtrace - please attach it as text or file. It will help us a lot with the debug.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature request]: name_your_feature_request"
+labels: enhancement
+assignees: nkaskov
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. 
+
+**Describe the solution or interface you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+It would help us to find the proper solution if you could describe a bit more about what algorithm you are trying to compile. It could be, for example, a public repository with your ongoing work, or a link to a discussion/proposal on ETH research.