Initial s390-tools-2.0.0 import

This commit is based on the s390-tools-1.39.0 version.

Changes on top of s390-tools-1.39.0:

 - Add MIT license to all source files
 - Add LICENSE file
 - Transform REAMDE to README.md (markdown)
 - Add AUTHORS.md file
 - Add CONTRIBUTING.md file
 - Move changelog from README to CHANGELOG.md file

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>

libvtoc/Makefile

@@ -0,0 +1,14 @@
+include ../common.mak
+
+lib = libvtoc.a
+
+all: $(lib)
+
+objects = vtoc.o
+
+$(lib): $(objects)
+
+install: all
+
+clean:
+	rm -f *.o $(lib)