add sonar-scanner-cli docs

Author: MikeBirnstiehl

sonarqube/sonarscanner.md

@@ -0,0 +1,7 @@
+# What is SonarScanner CLI?
+
+The [SonarScanner](https://redirect.sonarsource.com/doc/install-configure-scanner.html) is the official scanner used to run code analysis on SonarQube.
+
+# How to use this image
+
+Here you'll find the SonarScanner Docker image. For information on using this image, see the [SonarScanner](https://redirect.sonarsource.com/doc/install-configure-scanner.html) page in the SonarQube documentation.