i-1: First draft of a shared KMP library (#2)

- [x] Exposes a `Greeting` class.
- [x] Exposes a `Greeting` class test.

Co-authored-by: Emil Simeonov <emil@theliberatededge.org>
Reviewed-on: emil/AstrologyLibrary#2

local.properties

@@ -0,0 +1,10 @@
+## This file is automatically generated by Android Studio.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file should *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+sdk.dir=/home/emo/Android/Sdk