docs: new file Documentation/release-schedule.txt

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

Documentation/release-schedule.txt

@@ -0,0 +1,39 @@
+Release schedule
+----------------
+
+The util-linux uses <major>.<minor>.<maint> version numbering.
+Since the major version is pretty much fixed the release means an
+upgrade of minor number. Minor version is update roughly twice
+per year. Easiet way to estimate when next version will occur is
+to see time stamp of previous release.
+
+Before a release there are few release candidates, which will be
+collectively tested. During test period changes to code base are
+restricted. Usually there are two release candidates.
+
+  what	 lenght		what will be accepted to upstream
+  -------------------------------------------------------
+  rc1	 1-2 weeks	bug fixes only
+  rc2	 1-2 weeks	translations, fatal/trivial bug fixes
+
+The lengty time, usually about five months, after the release can
+be considered as merge window.
+
+Release criteria
+----------------
+
+For all releases is required:
+
+   - make checkincludes pass
+   - make checkconfig pass
+   - make distcheck pass
+   - cd tests && ./run.sh pass
+   - out-of-tree build works
+     cd .. && mkdir build && cd build && ../util-linux/configure && make
+
+   - ideally: build with uClibc, --with-slang
+
+See also
+--------
+
+Documentation/source-code-management.txt