Add doc gen instructions

docs/DOC_GEN.md

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+#Documentation generation
+
+##Setting up
+- install [python](https://www.python.org/)(2)
+ - when installing, tick to install the path variable
+ - may need restart after for installation to properly take effect
+- install a package manager like [pip](https://pip.pypa.io/en/latest/)
+ - if installed pip and doesnt work, restart or try easy_install command
+- install the dependencies with manager
+ - [Jinja2](https://pypi.python.org/pypi/Jinja2)
+ - [typedecorator](https://pypi.python.org/pypi/typedecorator)
+ - [markdown](https://pypi.python.org/pypi/Markdown)
+
+##Generating
+- Run in cmd `python -m ElunaDoc` when at `\LuaEngine\docs\`