add all modules, better gradle setup, and elixir for server

buildSrc/build.gradle.kts

@@ -0,0 +1,15 @@
+plugins {
+    `kotlin-dsl`
+}
+repositories {
+    gradlePluginPortal()
+}
+
+gradlePlugin {
+    plugins {
+        create("goPlugin") {
+            id = "goPlugin"
+            implementationClass = "moe.rosa.planterette.buildsrc.GoPlugin"
+        }
+    }
+}

buildSrc/src/main/kotlin/moe/rosa/planterette/buildsrc/GoPlugin.kt

@@ -0,0 +1,22 @@
+package moe.rosa.planterette.buildsrc
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.tasks.Exec
+
+class GoPlugin : Plugin<Project> {
+    override fun apply(project: Project) {
+        project.tasks.register("compileGo", Exec::class.java) {
+            group = "go"
+            description = "compile all go source files and output into build directory"
+            workingDir(project.layout.projectDirectory)
+            commandLine("go", "build", "-o", "../build/go")
+        }
+        project.tasks.register("testGo", Exec::class.java) {
+            group = "go"
+            description = "run go test"
+            workingDir(project.layout.projectDirectory)
+            commandLine("go", "test")
+        }
+    }
+}