examples: add initial examples for RFC

Add hello_world and random(generate UUID) examples

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1588816
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+GPATH
+GRTAGS
+GSYMS
+GTAGS
+*.cmd
+*.d
+*.dmp
+*.elf
+*.lds
+*.map
+*.o
+*.png
+*.swp
+*.ta
+cscope.*