Add docs

Sources/DependenciesMacros/Macros.swift

@@ -213,6 +213,30 @@ public macro DependencyEndpoint(method: String = "") =
 public macro DependencyEndpointIgnored() =
   #externalMacro(module: "DependenciesMacrosPlugin", type: "DependencyEndpointIgnoredMacro")
 
+/// Enables shorthand syntax for registering dependencies to DependencyValues
+///
+/// Now you can use simple syntax anywhere you would normally register a dependency:
+///
+///```swift
+/// extension DependencyValues {
+///   @DependencyEntry var myDependency: MyDependency
+/// }
+/// ```
+///
+/// which in turn expands to:
+///
+/// ```swift
+/// extension DependencyValues {
+///   @DependencyEntry var myDependency: MyDependency {
+///      get {
+///        self[MyDependency.self]
+///      }
+///      set {
+///        self[MyDependency.self] = newValue
+///      }
+///   }
+/// }
+/// ```
 @attached(accessor, names: named(get), named(set))
 public macro DependencyEntry() = #externalMacro(
     module: "DependenciesMacrosPlugin",