clarify DB config in README

README.md

@@ -49,6 +49,12 @@ Instructions to build the JAR file
 2. Run `./gradlew clean bootJar` to build a modern cloud native fully self contained JAR file which will be created at `build/libs` directory.
 3. Start it using `java -jar build/libs/fineract-provider.jar` (does not require external Tomcat)
 
+The tenants database connection details are configured [via environment variables (as with Docker container)](#instructions-to-run-using-docker-and-docker-compose), e.g. like this:
+
+    export fineract_tenants_pwd=verysecret
+    ...
+    java -jar fineract-provider.jar
+
 
 Instructions to build a WAR file
 ============
@@ -58,6 +64,8 @@ Instructions to build a WAR file
 
 We recommend using the JAR instead of the WAR file deployment, because it's much easier.
 
+Note that with the 1.4 release the tenants database pool configuration changed from Tomcat DBCP in XML to an embedded Hikari, configured by environment variables, see above.
+
 
 Instructions to execute Integration Tests
 ============