added README.md

README.md

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+Spectator Plus
+==============
+
+This project was created when I was exploring Minecraft's underworld map for tunnels and stuff.
+
+It was pretty annoying to type `/effect give` and `/effect clear` all the time, so I came up with this idea.
+
+Coding took 15 minutes, testing 5 and everything is working fine.
+
+So I decided to release this plugin publicly.
+
+Development
+-----------
+Project was created using Intellij IDEA Community with Gradle, so there you have everything that can be useful:
+- development environment
+- build tools
+- git management