update getting started

Author: olegantonyan

docs/getting_started.md

@@ -13,3 +13,14 @@ omnipackage --check
 ```
 
 Agent requires `podman` or `docker` as well as few other common Linux programs. It will check their availability upon start and report if anything is missing.
+
+## Building example project
+
+1. Clone [examples](https://github.com/omnipackage/examples) repository
+2. `cd examples`
+3. `omnipackage build c_makefile`
+
+Now you can install the resulting package. For example, Debian 12:
+```shell
+sudo dpkg -i /tmp/omnipackage-headless-build/omnipackage-example-c-debian_12/output/omnipackage-example-c_0.0.1-0_amd64.deb
+```