add gitignore.

+/*.conf
+/doc/frozen*
+/doc/kungfupanda*
+/doc/time*
+/html
+/ide/srs_xcode/srs_xcode.xcodeproj/project.xcworkspace/xcshareddata/
+/ide/srs_xcode/srs_xcode.xcodeproj/project.xcworkspace/xcuserdata/
+/ide/srs_xcode/srs_xcode.xcodeproj/xcuserdata/
+/research/aac/
+/research/api-server/.idea/
+/research/api-server/static-dir/mse
+/research/bat/
+/research/big/
+/research/bitch/
+/research/bott/
+/research/cgo/
+/research/dns/
+/research/empty/
+/research/golang/
+/research/librtmp/*.mp4
+/research/licenser/
+/research/players/.idea/
+/research/players/fls_player/
+/research/players/mic/
+/research/players/srs_player/.idea/
+/research/proxy/
+/research/redis-ocluster/
+/research/rtmfp/
+/research/snap/
+/research/speex/
+/test/
+