adding parts

FitGuide.md

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+- Parts
+  - Type
+    - Scope
+    - Adapter Ring
+    - ARD
+    - Polarizer
+    - Flip Cover
+
+  - Attachment Point +
+    - Name
+    - Attachment
+      - One Of
+        - ISO Thread
+        - UNC Thread
+        - Outside Diameter
+          - static value (to be attached to)
+        - Clamp
+          - min
+          - max
+- Manufacturers
+- Models
+- Colours
+- Part Types