Update README.md for building and running stacks

Related to space-ros#188
y

README.md

@@ -12,3 +12,42 @@ See individual template directories for details.
 * [rtems](./rtems)
 * [space_robots](./space_robots)
 * [zynq_rtems](./zynq_rtems)
+
+
+### Build stacks
+
+To build the docker images available in the stack, run the following command:
+
+```bash
+# To show the available options
+./build.sh -help
+# Usage: ./build.sh stack-name [options]
+# USAGE
+# -h, --help: display this help message
+#   stack-name: the name of the stack to build. Must be one of the following:
+#     - gui
+#     - nav2
+#     - moveit2
+
+# To build GUI stack
+./build.sh gui
+```
+
+### Starting a stack container
+
+To run the docker images available in the stack, run the following command:
+
+```bash
+# To show the available options
+./run.sh -help
+# Usage: ./build.sh stack-name [options]
+# USAGE
+# -h, --help: display this help message
+#   stack-name: the name of the stack to build. Must be one of the following:
+#     - gui
+#     - nav2
+#     - moveit2
+
+# To run GUI stack
+./run.sh gui
+```