add corruption crystal node

.gitignore

@@ -0,0 +1 @@
+/.idea

init.lua

@@ -5,4 +5,4 @@ local include, nodecore
 
 kc_violetcorruption = {}
 
---todo: include("")
+include("nodes")

nodes.lua

@@ -0,0 +1,23 @@
+-- LUALOCALS < ---------------------------------------------------------
+local include, nodecore
+= include, nodecore
+-- LUALOCALS > ---------------------------------------------------------
+
+local modname = minetest.get_current_modname()
+
+minetest.register_node(":corruptioncrystal", {
+    description = "Corruption Crystal",
+
+    mapcolor = { r = 255, g = 0, b = 255 }, -- todo: refine mapcolor if desired
+
+    groups = {
+        snappy = 1, -- todo: choose mining tool?
+        falling_node = 1, -- todo: decide if you want this (and falling_repose)
+        falling_repose = 1,
+        optic_opaque = 1,
+        stack_as_node = 1, -- todo: decide if you want this
+    },
+
+    tiles = {"kc_corruption_source.png"},
+    sounds = nodecore.sounds("nc_optics_glassy"), -- todo custom sounds
+})