samples: add a sample

Testing sample addition.

Signed-off-by: Carles Cufi <[email protected]>

samples/hello/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(hello_world)
+
+target_sources(app PRIVATE src/main.c)

samples/hello/README.rst

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+.. zephyr:code-sample:: hello_world
+   :name: Hello World
+
+   Print "Hello World" to the console.
+
+Hello World
+###########
+
+Overview
+********
+
+A simple sample that can be used with any :ref:`supported board <boards>` and
+prints "Hello World" to the console.
+
+Building and Running
+********************
+
+This application can be built and executed on QEMU as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :host-os: unix
+   :board: qemu_x86
+   :goals: run
+   :compact:
+
+To build for another board, change "qemu_x86" above to that board's name.
+
+Sample Output
+=============
+
+.. code-block:: console
+
+    Hello World! x86
+
+Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.

samples/hello/prj.conf

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+# nothing here

samples/hello/sample.yaml

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+sample:
+  description: Hello World sample, the simplest Zephyr
+    application
+  name: hello world
+common:
+  tags: introduction
+  integration_platforms:
+    - native_sim
+  harness: console
+  harness_config:
+    type: one_line
+    regex:
+      - "Hello World! (.*)"
+tests:
+  sample.basic.helloworld:
+    tags: introduction

samples/hello/src/main.c

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+/*
+ * Copyright (c) 2012-2014 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdio.h>
+
+int main(void)
+{
+	printf("Hello World! %s\n", CONFIG_BOARD_TARGET);
+
+	return 0;
+}