Add README.txt, mod.conf and screenshot.png

README.txt

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+Bulldozer mod for Minetest
+==========================
+
+Driveable bulldozer for pushing nodes and flattening ground.
+
+The entity spawner item is called bulldozer:bulldozer_item.
+
+Controls
+--------
+- Right click the bulldozer: Enter/exit vehicle
+- Up: Forward
+- Down: Reverse
+- Left: Turn left
+- Right: Turn right
+- Jump:
+	- Hold while moving forward to grade upwards
+- Sneak:
+	- Hold while moving forward to grade downwards
+	- Hold while reversing to prevent climbing on top of ground
+
+License
+-------
+Code: GPL 3
+Media: CC BY-SA 4.0
+
+Credits
+-------
+Made by Perttu "celeron55" Ahola
+

mod.conf

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+name = bulldozer
+description = Driveable bulldozer for pushing nodes and flattening ground
+author = celeron55
+title = Bulldozer