Add roadmap draft (Voxelands Direction Document)

not ideal, but that's better than nothing. roadmap was suggested by EliasFleckenstein

doc/direction.md

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+# Voxelands Direction Document *(draft)*
+
+Styling based on [Minetest Direction Document](https://github.com/minetest/minetest/blob/master/doc/direction.md).
+
+## 1. Long-term Roadmap
+
+To be done. Currently not much was done to even understand what we need
+in long-term. We can use medium-term as a long-term for now.
+
+## 2. Medium-term Roadmap
+
+The medium-term roadmap currently contains 3 things to add/change:
+
+1. Modding (implement as Game+Mods (MC-alike), not Game=Mods (MT-alike))
+2. Graphics (fix weird glitches and switch to IrrlichtMT) (#2)
+3. Workflow (add more people to the development, automatize releasing)
+
+## 3. Short-term Roadmap
+
+The short-term roadmap is temporary, it's here only while critical bugs
+(like crashes) aren't fixed.
+
+We can count these things as a short-term roadmap:
+
+1. Fix everything crashing (#1)
+2. Convert most of the docs from plaintext to markdown
+3. Do something with changelogs
+
+After these are done, this section won't be here anymore and we'll count
+bug-labeled issues as short-term.