Update README

README.md

@@ -4,42 +4,59 @@
 
 This action sets up a Swift environment on linux.
 
+Note that Linux is currently the only system supported by this action. Running it on other platforms will fail.
+
 ## Inputs
 
 ### `release-version`
 
-The (released) Swift version (e.g. `5.2.1`) to install. If given, `branch-name` and `version-tag` are ignored.
+The (released) Swift version (e.g. `5.2.2`) to install.<br/>
+*Note:* If given, `branch-name` and `version-tag` are ignored.
 
 ### `branch-name`
 
-The branch of the Swift version to install (e.g. `swift-5.2.1-release`).
+The branch of the Swift version to install (e.g. `swift-5.2.2-release`).<br/>
 Required if `release-version` is not set!
 
 ### `version-tag`
 
-The version tag of the Swift version to install (e.g. `swift-5.2.1-RELEASE`).
+The version tag of the Swift version to install (e.g. `swift-5.2.2-RELEASE`).<br/>
 Required if `release-version` is not set!
 
 ### `platform`
 
-The platform for which to install the Swift version (e.g. ubuntu18.04).
+The platform for which to install the Swift version (e.g. `ubuntu18.04`).<br/>
 Default: `ubuntu18.04`.
 
 ### `skip-apt`
 
-Whether the installation of dependencies (via apt) should be skipped.
+Whether the installation of dependencies (via apt) should be skipped.<br/>
 Default: `false`
 
 ## Outputs
 
 ### `install-path`
 
-The path where Swift was installed.
+The path where Swift was installed.<br/>
+Note that this can usually be ignored, since SwiftyActions adds the `${{install-path}}/usr/bin` to the `PATH` environment variable.
 
 ## Example Usage
 
-```
+In general, the `release-version` input parameter should be used to install a final release of Swift. 
+To e.g. install Swift 5.2.2, use the following snippet:
+```yaml
 uses: sersoft-gmbh/SwiftyActions@v1
 with:
-    release-version: 5.2.1
+    release-version: 5.2.2
 ```
+
+However, SwiftyActions also supports installing other snapshots using the `branch-name` and `version-tag` input parameters.
+So, to e.g. install a the Swift 5.2 development snapshot built on 14th of April 2020, use the following snippet:
+
+```yaml
+uses: sersoft-gmbh/SwiftyActions@v1
+with:
+    branch-name: swift-5.2-branch
+    version-tag: swift-5.2-DEVELOPMENT-SNAPSHOT-2020-04-14-a
+``` 
+