[Doc] Repository documentation (#117)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help reproduce and fix the issue
+title: "Bug: "
+labels: [ bug ]
+body:
+  - type: input
+    attributes:
+      label: Version
+      description: What version of imgui-java did you use?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What happened?
+      description: Also tell us, what did you expect to happen?
+      placeholder: Tell us what you see!
+      value: A bug happened!
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Reproduction
+      description: How did you manage to make the error happen?
+      placeholder: How did you do it?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: bash

.github/ISSUE_TEMPLATE/missing_bindings.yml

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+name: Missing Bindings
+description: Create a report to help reproduce and fix the issue
+title: "Missing Bindings: "
+labels: [ "missing binding" ]
+body:
+  - type: input
+    attributes:
+      label: Version
+      description: What version of imgui-java did you use?
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: What part of the binding has gaps?
+      options:
+        - Dear ImGui
+        - ImNodes
+        - imgui-node-editor
+        - ImGuizmo
+        - implot
+        - ImGuiColorTextEdit
+        - ImGuiFileDialog
+        - ImGui Club MemoryEditor
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What is missing?
+      description: Tell us, what part of the API is missing?
+      placeholder: Tell us what you are missing!
+      value: Something is missing!
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        Please, provide additional references like links to a source code of the missing API. 
+        If there are several ways to implement the API, provide a pov of yourself.