Add Scala - SBT example (#134)

* Add Scala - SBT example

* Add Scala - SBT example to README

README.md

@@ -72,6 +72,7 @@ See [Examples](examples.md) for a list of `actions/cache` implementations for us
 - [Python - pip](./examples.md#python---pip)
 - [Ruby - Gem](./examples.md#ruby---gem)
 - [Rust - Cargo](./examples.md#rust---cargo)
+- [Scala - SBT](./examples.md#scala---sbt)
 - [Swift, Objective-C - Carthage](./examples.md#swift-objective-c---carthage)
 - [Swift, Objective-C - CocoaPods](./examples.md#swift-objective-c---cocoapods)
 

examples.md

@@ -12,6 +12,7 @@
 - [Python - pip](#python---pip)
 - [Ruby - Gem](#ruby---gem)
 - [Rust - Cargo](#rust---cargo)
+- [Scala - SBT](#scala---sbt)
 - [Swift, Objective-C - Carthage](#swift-objective-c---carthage)
 - [Swift, Objective-C - CocoaPods](#swift-objective-c---cocoapods)
 
@@ -286,6 +287,21 @@ When dependencies are installed later in the workflow, we must specify the same
     key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
 ```
 
+## Scala - SBT
+
+```yaml
+- name: Cache SBT ivy cache
+  uses: actions/cache@v1
+  with:
+    path: ~/.ivy2/cache
+    key: ${{ runner.os }}-sbt-ivy-cache-${{ hashFiles('**/build.sbt') }}
+- name: Cache SBT
+  uses: actions/cache@v1
+  with:
+    path: ~/.sbt
+    key: ${{ runner.os }}-sbt-${{ hashFiles('**/build.sbt') }}
+```
+
 ## Swift, Objective-C - Carthage
 
 ```yaml