Add the PlatformLibrary sample to the new "sample" vendor

This adds the PlatformLibrary samples previously located in development/samples.
This also creates all the files required to build an add-on including the optional
library provided by PlatformLibrary
diff --git a/README.txt b/README.txt
new file mode 100644
index 0000000..2649eae
--- /dev/null
+++ b/README.txt
@@ -0,0 +1,3 @@
+To build the add-on:
+	make -j8 PRODUCT-sample_addon-sdk_addon
+   
\ No newline at end of file