build: update .gitignore

Author: lokic

.gitignore

@@ -0,0 +1,22 @@
+### JetBrains
+.idea/
+*.iml
+**/out
+html
+*.ipr
+*.iws
+
+
+### Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+