Update ReadMe.md

Author: h0tk3y

libraries/ReadMe.md

@@ -39,19 +39,16 @@ If your maven build is failing with Out-Of-Memory errors, set JVM options for ma
 
 Gradle plugin sources can be found at the [kotlin-gradle-plugin](tools/kotlin-gradle-plugin) module.
 
-To build only gradle plugin and necessary dependencies use the following command:
-```bash
-mvn clean install -pl :kotlin-gradle-plugin -am
-# to skip all tests also add -DskipTests -PnoTest
-```
+To build the Gradle plugin and the subplugins, first build the core libraries and other tools (the Gradle and Maven builds above) and then, inside `tools/gradle-tools`, run:
+
+    gradlew clean install
 
 ### Gradle integration tests
 
 Gradle integration tests can be found at the [kotlin-gradle-plugin-integration-tests](tools/kotlin-gradle-plugin-integration-tests) module.
 
-These tests are slow, so they are *skipped by default*.
+To run integration tests, run from `tools/gradle-tools`:
 
-To run integration tests use the `run-gradle-integration-tests` profile:
-```bash
-mvn clean install -pl :kotlin-gradle-plugin-integration-tests -am -Prun-gradle-integration-tests
-```
+    gradlew :kotlin-gradle-plugin-integration-tests:test
+    
+Android integration tests are disabled by default, add `-Pandroid` to include them as well.