samples: zephyr: add hello-world
This is a minimal example application that works on various boards,
without target-specific definitions, device tree overlay files, etc.
It's been tested on frdm_k64f, 96b_carbon, and 96b_nitrogen.
Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
diff --git a/samples/zephyr/hello-world/boards/.gitignore b/samples/zephyr/hello-world/boards/.gitignore
new file mode 100644
index 0000000..27e8bd8
--- /dev/null
+++ b/samples/zephyr/hello-world/boards/.gitignore
@@ -0,0 +1 @@
+*-local.conf
diff --git a/samples/zephyr/hello-world/boards/README.rst b/samples/zephyr/hello-world/boards/README.rst
new file mode 100644
index 0000000..1715f42
--- /dev/null
+++ b/samples/zephyr/hello-world/boards/README.rst
@@ -0,0 +1,2 @@
+You can place per-board configuration and device tree overlays
+here. See the comments in the Makefile for more information.