Added FAQ section

README.md

@@ -65,6 +65,10 @@ The config file is automatically migrated when GitLab Runner was installed from
 * [Bleeding edge (development)](docs/install/bleeding-edge.md)
 * [Install development environment](docs/development/README.md)
 
+### Troubleshoting
+
+* [FAQ](docs/faq/README.md)
+
 ### Advanced Configuration
 
 * [See advanced configuration options](docs/configuration/advanced-configuration.md)

docs/faq/README.md

+# FAQ
+
+## 1. Where are logs stored for service?
+
++ If the GitLab Runner is run as service on Linux/OSX  the daemon logs to syslog.
++ If the GitLab Runner is run as service on Windows it logs to System's Event Log.
+
+## 2. Run in `--debug` mode
+
+Is it possible to run GitLab Runner in debug/verbose mode. Do it from terminal:
+
+```
+gitlab-runner --debug run
+```