Created Upload Types and Traits (markdown)

Upload-Types-and-Traits.md

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+All files uploaded on itch.io have a **type** and a list of **traits** (which can be empty).
+
+
+## Upload types
+
+Most are self-descriptive:
+
+- `default`: Executables.
+- `documentation`: Documentation or Instructions.
+- `book`: Book or Document.
+- `soundtrack`
+- `video`
+- `mod`
+- `audio_assets`
+- `graphical_assets`
+- `sourcecode`
+- `other`
+
+
+## Upload traits
+
+- Platform (only for `default` upload types):
+  - `p_windows`
+  - `p_linux`
+  - `p_osx` - macOS
+  - `p_android`