initial commit of libosmo-abis

still many things to get fixed
diff --git a/include/osmocom/gsm/Makefile.am b/include/osmocom/gsm/Makefile.am
new file mode 100644
index 0000000..f9d5e7c
--- /dev/null
+++ b/include/osmocom/gsm/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS=abis