Maint: Added a HOWTO on releasing LibUCW

diff --git a/maint/HOWTO b/maint/HOWTO
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+How to release libucw
+~~~~~~~~~~~~~~~~~~~~~
+
+- Run maint/abi-check-exports. No symbols should be listed except for _init
+  and friends. Otherwise, run maint/abi-map-symbols, update maint/libucw.abi
+  accordingly, and call maint/abi-rename symbols to fix headers.
+
+- Update version numbers and ABI suffix in ucw/default.cfg:
+      - If there were major changes, or changes which are not backward
+        compatible on source level, increase the major number.
+      - If new features were added, increase the minor number.
+      - Otherwise, increase only the third number.
+      - If anything in the ABI was changed, update UCW_ABI_SUFFIX.
+
+- git-tag vX.Y.Z
+
+- Run maint/release