some readme updates

Author: craig-day

README.md

@@ -1,16 +1,34 @@
 # setup-dhall
 
-Github action to install a specific version of https://dhall-lang.org and run commands
+Github action to install a specific version of https://dhall-lang.org.
 
-## Inputs
+This will add the following executables to your `PATH`, making them available for further actions:
 
-### `version`
+- `dhall`
+- `dhall-to-json`
+- `dhall-to-yaml`
+- `json-to-dhall`
+
+### Inputs
+
+#### `version`
 
 **Optional** The version of Dhall to install. Default: `latest`.
 
-## Usage
+### Usage
+
+#### Basic Example
+
+```yaml
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: craig-day/setup-dhall@v2
+      - run: dhall version
+```
 
-### Basic Example
+#### With a Specific Version
 
 ```yaml
 jobs:
@@ -19,7 +37,7 @@ jobs:
     steps:
       - uses: craig-day/setup-dhall@v2
         with:
-          version: 1.24.0
+          version: '1.28.0'
       - run: dhall version
       - run: dhall-to-json --version
 ```