Add issue template for missing shader instructions (#5048)

* Add issue template for missing shader instructions

* fixup! Add issue template for missing shader instructions

* Update .github/ISSUE_TEMPLATE/missing_shader_instruction.yml

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Co-authored-by: Ac_K <Acoustik666@gmail.com>

.github/ISSUE_TEMPLATE/missing_shader_instruction.yml

@@ -0,0 +1,19 @@
+name: Missing Shader Instruction
+description: Shader Instruction is missing in Ryujinx.
+title: "[GPU]"
+labels: [gpu, not-implemented]
+body:
+  - type: textarea
+    id: instruction
+    attributes:
+      label: Shader instruction
+      description: What shader instruction is missing?
+    validations:
+      required: true
+  - type: textarea
+    id: required
+    attributes:
+      label: Required by
+      description: Add links to the [compatibility list page(s)](https://github.com/Ryujinx/Ryujinx-Games-List/issues) of the game(s) that require this instruction.
+    validations:
+      required: true