Add sonar properties

sonar-project.properties

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+# must be unique in a given SonarQube instance
+sonar.projectKey=org.springframework.samples.petclinic.java
+
+# this is the name displayed in the SonarQube UI
+sonar.projectName=petclinic.java
+sonar.projectVersion=1.0
+
+# Path is relative to the sonar-project.properties file
+sonar.sources=src/main/java
+
+# path to project binaries, for example directory of Java bytecode
+sonar.binaries=target/classes
+
+# sonar.tests and sonar.junit.reportsPath are required to display "Unit Test Success" rate
+# path to test source directory
+sonar.tests=src/test/java
+# Path to the directory containing all the |*.xml JUnit report files. 
+sonar.junit.reportsPath=target/test-results
+
+# sonar.jacoco.reportPath is required to display "Unit Tests Coverage"
+# Path to the JaCoCo report file containing coverage data by unit tests.
+sonar.jacoco.reportPath=target/jacoco/test.exec
+
+# The value of the property must be the key of the language.
+sonar.language=java
+sonar.java.source=1.7
+
+# Encoding of the source code. Default is default system encoding
+sonar.sourceEncoding=UTF-8