restructure, begin implementing libplt

plt-build/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    kotlin("multiplatform")
+}
+kotlin {
+    jvm()
+    val nativeTarget = if(System.getProperty("os.arch") == "aarch64") {
+        linuxArm64("native")
+    } else {
+        linuxX64("native")
+    }
+    nativeTarget.binaries {
+        executable()
+    }
+    sourceSets {
+        nativeMain.dependencies {
+            implementation(project(":libplt"))
+        }
+        nativeTest.dependencies {
+            implementation(project(":libplt"))
+            implementation(kotlin("test"))
+        }
+        jvmMain.dependencies {
+            implementation(project(":libplt"))
+        }
+        jvmTest.dependencies {
+            implementation(project(":libplt"))
+            implementation(kotlin("test"))
+        }
+    }
+}