Add readme file with simple 'howto make zip file' instruction

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+Git plugin for TeamCity
+=======================
+
+How to build .zip file
+----------------------
+
+1. Go to `Idea -> Properties -> Appearance & Behavior -> Path Variables`;
+2. Fill variable `TeamCityDistribution` value as path to _TeamCity directory_;
+3. Go to `Build -> Build Artifacts -> zip -> Build`;
+4. After that plugin file `jetbrains.git.zip` will be at `dist` folder.
+
+_TeamCity directory_ is:
+* In case when you have sourcecode of TeamCity - it is path to `dist-teamcity-tomcat` artifact (`Build -> Build Artifacts -> dist-teamcity-tomcat -> Build`, then folder will be `<teamcity project dir>/.idea_artifacts/dist-teamcity-tomcat`);
+* In case when you have TeamCity tar.gz file then it is path to unpacked distributive directory.