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>

iucvterm/src/Makefile

@@ -0,0 +1,37 @@
+#! /usr/bin/make -f
+
+include ../../common.mak
+
+ifndef GETTEXT_TEXTDOMAIN
+GETTEXT_TEXTDOMAIN = iucvterm
+endif
+
+ALL_CPPFLAGS += -I../include
+ALL_CPPFLAGS += -DUSE_NLS -DGETTEXT_TEXTDOMAIN=\"$(GETTEXT_TEXTDOMAIN)\"
+#ALL_CPPFLAGS += -D__DEBUG__
+
+PROGRAMS = iucvconn iucvtty
+SYSTOOLS = ttyrun
+
+all: $(PROGRAMS) $(SYSTOOLS)
+check:
+install:
+	for prg in $(PROGRAMS); do \
+	  $(INSTALL) -g $(GROUP) -o $(OWNER) -m 755 $$prg $(DESTDIR)$(USRBINDIR) ; \
+	done
+	for prg in $(SYSTOOLS); do \
+	  $(INSTALL) -g $(GROUP) -o $(OWNER) -m 755 $$prg $(DESTDIR)$(BINDIR) ; \
+	done
+
+clean:
+	-rm -f *.o $(PROGRAMS) $(SYSTOOLS)
+
+iucvconn: iucvconn.o getopt.o auditlog.o functions.o
+
+iucvtty: LDLIBS = -lutil
+iucvtty: iucvtty.o getopt.o auditlog.o functions.o
+
+ttyrun: GETTEXT_TEXTDOMAIN = ttyrun
+ttyrun: ttyrun.o
+
+.PHONY: install clean