add releasing information

RELEASING.md

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+# Releasing
+
+1. Ensure the correct JDK is installed.
+2. Verify GPG is configured and the keys are registered, see https://docs.gradle.org/current/userguide/signing_plugin.html. 
+3. Configure `~/.gradle/gradle.properties` with the GPG key information.
+4. Open https://oss.sonatype.org/#profile;User%20Token and generate a new token.
+5. Run `SONATYPE_LOGIN=$LOGIN_KEY SONATYPE_PASSWORD=$PASSWORD_KEY ./gradlew  clean release`
+6. Update the version in the README.md file.