Added gradle instructions.

layers/+lang/java/README.org

@@ -19,7 +19,8 @@
     - [[#configuration][Configuration]]
     - [[#usage][Usage]]
   - [[#ensime][ENSIME]]
-    - [[#installation-2][Installation]]
+    - [[#installation-when-using-sbt][Installation when using SBT]]
+    - [[#installation-when-using-gradle][Installation when using Gradle]]
     - [[#configuration-1][Configuration]]
     - [[#usage-1][Usage]]
     - [[#issues][Issues]]
@@ -195,13 +196,17 @@ Another backend option is the ENSIME server, which is a lot more responsive than
 Eclim. ENSIME is originally made to work with Scala but it now works with plain
 Java projects as well.
 
-*** Installation
+*** Installation when using SBT
 Find it with your favourite package manager, eg:
 #+BEGIN_SRC shell
   nix-env --install sbt
 #+END_SRC
 or refer to [[http://www.scala-sbt.org/download.html][the sbt installation instructions]].
 
+*** Installation when using Gradle
+Refer to the [[https://ensime.org/build_tools/gradle/][Ensime installation instructions]] to install the =ensime-gradle=
+plugin.
+
 *** Configuration
 Follow [[https://ensime.github.io/build_tools/sbt/][the ENSIME configuration instructions]]. Spacemacs uses
 the development version of Ensime so follow the appropriate steps.

layers/+lang/scala/README.org

@@ -35,7 +35,8 @@ version (Stable). Please add the following lines to =dotspacemacs/user-init=:
 and project-wide type-checking.
 
 ENSIME requires a configuration file at the root of each Scala project. It
-provides an SBT plugin to generate these files.
+provides an SBT plugin, a gradle plugin and others (see [[http://ensime.org/build_tools/][ensime.org]] for a full
+list) to generate these files.
 
 Installation instructions and usage can be found in the =Java= layer
 [[https://github.com/syl20bnr/spacemacs/tree/develop/layers/%2Blang/java/README.org#ensime][README.org]].