added missing project files

project/GalliaCommonSettings.scala

@@ -0,0 +1,35 @@
+import sbt     ._
+import sbt.Keys._
+
+// ===========================================================================
+object GalliaCommonSettings {
+
+  val mainSettings = Seq(
+    organizationHomepage := Some(url("https://github.com/galliaproject")),
+    startYear            := Some(2021),
+    developers           :=
+      List(Developer(
+        id    = "anthony-cros",
+        name  = "Anthony Cros",
+        email = "contact.galliaproject@gmail.com",
+        url   = url("https://github.com/anthony-cros") )),
+
+    // ---------------------------------------------------------------------------		  
+         scalaVersion  := GalliaScalaVersions.supported.head,
+    crossScalaVersions := GalliaScalaVersions.supported)
+
+  // ===========================================================================
+  // TODO: t210121165741: -Xdisable-assertions (also turns off require?)  
+  scalacOptions ++= Seq(
+        "-encoding", "UTF-8",  
+      //"-Yimports:java.lang,scala,scala.Predef,scala.util.chaining,aptus.Anything_" -- not possible for 2.12 it seems (TODO: t210308154253 confirm)
+        "-Ywarn-value-discard") ++ 
+      // ---------------------------------------------------------------------------
+      (scalaBinaryVersion.value match {
+        case "2.13" => Seq("-Ywarn-unused:imports")
+        case _      => Seq("-Ywarn-unused-import" ) })
+
+}
+
+// ===========================================================================
+

project/GalliaScalaVersions.scala

@@ -0,0 +1,15 @@
+import sbt._
+
+// ===========================================================================
+object GalliaScalaVersions {
+  val scala213 = "2.13.4"
+  val scala212 = "2.12.13"
+
+  // ---------------------------------------------------------------------------
+  val supported = List(
+    scala213,
+    scala212)
+}
+
+// ===========================================================================
+

project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.4.7

project/plugins.sbt

@@ -0,0 +1,2 @@
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.7")
+addSbtPlugin("com.jsuereth"   % "sbt-pgp"      % "2.0.1") // required by sbt-sonatype above