Add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2017 Daniel Borchmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+Mods for our personal minetest server
+=====================================
+
+This is a collection of mods as used by our personal minetest
+server.  Additionally, changes to these modes (like disabling
+certain features) are included as separate patches.  They can be
+applied by
+
+    for diff in *.diff; od
+      patch -p1 < $diff
+    done
+
+Before updating mods, unapply the patches by passing the `-R` switch to the
+patch command.
+
+For licenses and copyrights see the corresponding mods.  The rest is licensed
+under an MIT License.