Added gitignore, removed .idea folder

# Please enter the commit message for your changes. Lines starting
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# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	new file:   .gitignore
#	deleted:    .idea/copyright/profiles_settings.xml
#	deleted:    .idea/libraries/Desktoplibs.xml
#	deleted:    .idea/libraries/Mainlibs.xml
#	deleted:    .idea/libraries/gdx_backend_lwjgl.xml
#	deleted:    .idea/libraries/gdx_backend_lwjgl_natives.xml
#	deleted:    .idea/libraries/gdx_natives.xml
#	deleted:    .idea/misc.xml
#	deleted:    .idea/modules.xml
#	deleted:    .idea/scopes/scope_settings.xml
#	deleted:    .idea/uiDesigner.xml
#	deleted:    .idea/workspace.xml
#