Add issue templates (#514)

Author: rob93c

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a bug report
+title: ''
+labels: bug
+assignees: ''
+type: Bug
+
+---
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Steps to reproduce the behavior:
+
+1. Send the bot the file or text
+2. See error
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Files**
+
+If applicable, attach any file highlighting your problem.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+type: Feature
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is.
+
+**Describe the solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/support-new-file-format.md

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+---
+name: Support a new file format
+about: Suggest to enable the support for a new format
+title: Enable support for FORMAT format
+labels: enhancement
+assignees: ''
+type: Task
+
+---
+
+**Which file format do you need the bot to support?**
+
+Specify the format.
+
+**Sample file**
+
+If possible, please attach a sample file.
+
+**Additional context**
+
+Add any other context the feature request here.