Small docs

- Added new one to work on soon

small_doc_parser_modules.md

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+### Imports and modules
+
+Most aspects of the parser are concerned with entities that are only ever created _within the parser_ itself. There is however, one case where this is not true. This is when dealing with `import` statements.
+
+For such a feature such as module importing to work we need to have a way to manage what modules need be imported given a set of _already in-progress_ modules.