[gitignote] update to allow some project files

.gitignore

@@ -1,6 +1,30 @@
+# Created by https://www.gitignore.io/api/sbt,scala
+# Edit at https://www.gitignore.io/?templates=sbt,scala
+
+### SBT ###
+# Simple Build Tool
+# http://www.scala-sbt.org/release/docs/Getting-Started/Directories.html#configuring-version-control
+
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+.history
+.cache
+.lib/
+
+### Scala ###
+*.class
+*.log
+
+# End of https://www.gitignore.io/api/sbt,scala
+
+### IntelliJ ###
 *.iml
 .idea/
-project/
-target/
+
+### Metals ###
 .bloop/
 .metals/

project/build.properties

@@ -0,0 +1 @@
+sbt.version = 1.2.8