Add gradle wrapper jar

.gitignore

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+# Compiled source #
+###################
+*.com
+*.class
+*.dll
+*.exe
+*.o
+*.so
+
+# Packages #
+############
+# it's better to unpack these files and commit the raw source
+# git has its own built in compression methods
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.zip
+
+# Logs and databases #
+######################
+*.log
+
+# OS generated files #
+######################
+.DS_Store*
+ehthumbs.db
+Icon?
+Thumbs.db
+
+# Editor Files #
+################
+*~
+*.swp
+
+# Gradle Files #
+################
+.gradle
+.ivy2
+.ivy2.cache
+.m2
+!gradle-wrapper.jar
+
+# Build output directies
+/target
+*/target
+/build
+*/build
+
+# IntelliJ specific files/directories
+out
+.idea
+*.ipr
+*.iws
+*.iml
+atlassian-ide-plugin.xml
+
+# Eclipse specific files/directories
+.classpath
+.project
+.settings
+.metadata
+
+# NetBeans specific files/directories
+.nbattrs
+/bin
+
+#.gitignore in subdirectory
+#.gitignore
+
+### infer ###
+# infer- http://fbinfer.com/
+infer-out
+*/infer-out
+.inferConfig
+*/.inferConfig