sonar-project.properties: add sonarQube config file

sonar-project.properties

+# must be unique in a given SonarQube instance
+sonar.projectKey=bigwig_visu
+# --- optional properties ---
+# defaults to project key
+sonar.projectName=BigWig visualisation
+# defaults to 'not provided'
+sonar.projectVersion=0.1
+# Path is relative to the sonar-project.properties file. Defaults to .
+sonar.sources=.
+# Encoding of the source code. Default is default system encoding
+sonar.sourceEncoding=UTF-8
+#Description of the project
+sonar.projectDescription=A tools to visualise bigwig coverage.
+#----- Default SonarQube server
+sonar.host.url=http://localhost:9000
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