update textures, add compress script

.directory

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+[Dolphin]
+PreviewsShown=true
+Timestamp=2016,10,22,19,24,59
+Version=3

README.md

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+# minetest-texturepack-nature-test
+Nature test is a 32x 32 texturepack for the open-source game Minetest. It's compatible with the fachwerk mod, but other will follow
+
+This work is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/.
+
+# How to use
+click download zip and extract it too your texturepacks folder in minetest. You will found this folder in ~/.minetest/ or in your installation directory.
+An other option to install it, wich only works for unix like systems is shown later. This instructions are for Debian GNU / Linux and ubuntu:
+run "apt-get install git" with root previlegs. 
+Then "cd ~/.minetest/textures" and "git  clone https://github.com/mbblp/minetest-texturepack-nature-test".
+
+# Credits
+
+azekill_DIABLO:                         
+default_cobble.png 

compress.sh

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+#! /bin/bash
+
+rm .directory;
+
+# update files on github
+git status;
+git add *
+git commit;
+git push;
+
+# create work directory
+echo "copying files to a tmp directory ...";
+cp ../minetest-texturepack-nature-test-master/ /tmp/minetest-texturepack-nature-test-master -rf &&
+echo "finished [ok]";
+
+# optimizing images
+echo "compressing with optipng, output as zip";
+cd /tmp;
+optipng minetest-texturepack-nature-test-master/* &&
+rm /home/mbb/minetest/nature-test-master.zip;
+zip -r ~/minetest/nature-test-master.zip  minetest-texturepack-nature-test-master/*;
+sync;
+rm -rf /tmp/minetest-texturepack-nature-test-master
+echo "now your pack is compressed! What about uploading it to the minetest forums?"