build : gitignore에 kotlin 추가

.gitignore

@@ -1,6 +1,31 @@
 
-# Created by https://www.toptal.com/developers/gitignore/api/androidstudio,macos
-# Edit at https://www.toptal.com/developers/gitignore?templates=androidstudio,macos
+### Kotlin ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+
+# End of https://www.toptal.com/developers/gitignore/api/kotlin
 
 ### macOS ###
 # General