Add issue templates

...so we can make issues more beautiful!

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug] "
+labels: "bug \U0001F41B"
+assignees: ''
+
+---
+
+**What's the bug?**
+<!-- Please tell us about the bug as short and easy to understand. -->
+
+**How do we reproduce it?**
+<!-- Do:
+1. Use `something function` in `messageCreate` event
+2. Make a message
+3. Bamm!
+
+Don't:
+1. Run code
+2. Error!
+-->
+
+**What should have happened?**
+<!-- We might not know what you were expecting. Please tell us. -->
+
+**What is actually happening?**
+<!-- Please tell us the result of the code. -->
+
+**What versions you're using?**
+ - OS: <!-- [e.g. macOS 11.1 Big Sur] -->
+ - Deno: <!-- [e.g. Deno 1.6.1] -->
+ - Harmony: <!-- [e.g. Harmony 0.9.0] -->
+
+**Do you have anything to tell us more about the bug?**
+<!-- If you do, please tell us more in here. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature Request] "
+labels: enhancement ✨
+assignees: ''
+
+---
+
+**What do you want to request?**
+<!-- Please tell us about your request as short and easy to understand. -->
+
+<!-- !!REMOVE THIS TAG IF YOU ALREADY HAVE(..or thought about) SOME SOLUTIONS!!
+**Do you have any solutions?**
+If you have, please tell us so we can add(or at least think about) your solution!
+-->
+
+**Do you have anything to tell us about your request?**
+<!-- If you do, please tell us more in here. -->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Question about this project
+title: "[Question] "
+labels: question ❓
+assignees: ''
+
+---
+
+**What question do you have?**
+<!-- Please tell us your question as short and easy to understand. -->