Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/materials/groups/MATGROUP_MISC b/doc/materials/groups/MATGROUP_MISC
new file mode 100644
index 0000000..b19c7d9
--- /dev/null
+++ b/doc/materials/groups/MATGROUP_MISC
@@ -0,0 +1,5 @@
+Gruppenid:
+MATGROUP_MISC
+
+Name:
+verschiedene Materialien, die nicht naeher zugeordnet sind (als fest, fluessig, gasfoermig)