Add README

README.md

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+# NodeCore Extended Rotating
+
+This mod follows in the footsteps of the useful [Extended Placement] mod for
+[Minetest] and adds the ability to rotate certain nodes from [NodeCore] such
+as optics and doors easily, without having to cycle through all possible
+rotations every time.
+
+Rotating a node can be done in two ways, either by clicking the center or the
+edge of a face. By interacting with the center, the node rotates around that
+face. When interacting with the edge, the node is "pushed" that way, rotating
+away from you. Sneaking inverts the direction of the rotation.
+
+At this time, nodes that can be rotated are hardcoded into the mod, since
+their valid orientations can't be easily extracted. A function mimicking
+NodeCore's own rotation logic has to be provided.

mod.conf

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 name = nc_extended_rotating
 title = NodeCore Extended Rotating
 author = copygirl
-description = Improves rotating of doors and optics in NodeCore.
+description = Rotate optics and doors from NodeCore with ease.
 depends = nc_api_all