Added public files
Roughly added all public files. Probably missed some, though.
diff --git a/doc/materials/materials/MAT_PLASTIC b/doc/materials/materials/MAT_PLASTIC
new file mode 100644
index 0000000..6c55327
--- /dev/null
+++ b/doc/materials/materials/MAT_PLASTIC
@@ -0,0 +1,18 @@
+Materialid:
+MAT_PLASTIC "plastic"
+
+Name:
+"kuenstliches Material" "kuenstlichen Materials" "kuenstlichem Material" "kuenstlichen Material"
+
+Geschlecht:
+N
+
+Beschreibung:
+Kunststoff
+
+Erkennbarkeit:
+MAT_MISC_SOLID:35
+MAT_PLASTIC
+
+Gruppenzugehoerigkeit:
+MATGROUP_SOLID:100