initial setup and first notes

.gitignore

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+# IntelliJ IDEA
+.idea/
+*.iml
+*.iws
+*.ipr
+out/
+.idea_modules/
+
+# Compiled files
+*.class
+*.jar
+*.war
+*.ear
+target/
+build/
+
+# Logs
+*.log
+log/
+logs/
+
+# OS specific files
+.DS_Store
+Thumbs.db
+
+# Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+
+# Gradle
+.gradle/
+build/
+
+# Node.js
+node_modules/
+npm-debug.log
+yarn-error.log