Merge pull request #5 from nnellans/nnellans-patch-4

Clarify optional properties in README

Author: nnellans

README.md

@@ -361,7 +361,8 @@ jobs:
     # option 2 - specify environment name and url
     environment:
       name: envName
-      url: someUrl
+      url: someUrl # optional
+      deployment: true # optional, default: true. setting to false will not create a deployment object, not compatible with custom deployment protection rules
 ```
 - `envName` can be a string or any expression (except for the `secrets` context)
 
@@ -622,6 +623,19 @@ jobs:
 
 ---
 
+# Expressions
+[Documentation - Evaluate expressions in workflows and actions](https://docs.github.com/en/actions/reference/workflows-and-actions/expressions)
+
+### `case` expression
+
+```
+case( pred1, val1, pred2, val2, ..., default )
+```
+
+- Evaluates predicates in order and returns the value corresponding to the first predicate that evaluates to true. If no predicate matches, it returns the last argument as the default value.
+
+---
+
 # Links
 - official github actions: https://github.com/orgs/actions/repositories
 - official azure actions: https://github.com/marketplace?query=Azure&type=actions&verification=verified_creator