Add issue templates (#940)

.github/ISSUE_TEMPLATE/1 new type.yml

@@ -0,0 +1,25 @@
+name: 💡 Suggest new type
+description: '​‌‍⁠ ' # Magic whitespace to hide this required field
+labels: 'type addition'
+
+body:
+  - type: textarea
+    id: description
+    validations:
+      required: true
+    attributes:
+      label: Type description + examples
+
+  - type: textarea
+    id: type
+    attributes:
+      label: Type source
+      description: If you already have the type source, enter it here as a starting point for a the discussion
+
+  - id: requirements
+    type: checkboxes
+    attributes:
+      label: Search existing types and issues first
+      options:
+        - label: I tried my best to look for it
+          required: true

.github/ISSUE_TEMPLATE/2 bug report.yml

@@ -0,0 +1,20 @@
+name: 🐛 Report bug
+description: '​‌‍⁠ ' # Magic whitespace to hide this required field
+labels: bug
+
+body:
+  - type: textarea
+    id: description
+    validations:
+      required: true
+    attributes:
+      label: Bug description
+
+  - type: input
+    id: repro
+    validations:
+      required: true
+    attributes:
+      label: Repro
+      description: |
+        Open [this playground](https://www.typescriptlang.org/play/?#code/JYWwDg9gTgLgBDAnmApnA3gUQB4GMVgwC+cAZlBCHAORKoC0pKAzjNQNwCwAUD3WgDEIEOAF4MPAJABXAHbBc0WQC44rKMFkBzLt0lQAhpoBGEAO6rTEADYoDs3UV19kaAHIQASkdmmzYuBx8QgAeIQgAGhpDE3NqAD5dOGS4AHpUuAA9AH4eIA), write a piece of code that fails your expectations, click "Share", and paste the URL here

.github/ISSUE_TEMPLATE/3 enhancement.md

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+---
+name: ♻️ Propose change or improvement to existing types
+about: '​‌‍⁠ ' # Magic whitespace to hide this required field
+labels: 'enhancement'
+---