Create README.md

Author: muffe

README.md

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+# enum-constraint
+A Symfony Validator constraint that validates of given strings a valid cases in a given PHP 8 Enum
+
+```
+enum ContactCategory: string
+{
+    case Child           = 'Child';
+    case Grandchild      = 'Grandchild';
+}
+
+use Muffe\EnumConstraint\Constraints\Enum;
+
+#[
+    Enum(
+        enumType: ContactCategory::class,
+    )
+]
+public ?string $category = null;
+```
+
+Validates that $category contains a string that is equal to the backed value of one of the given enum cases, or the name of the case if no backed values are given.
+
+```
+use Muffe\EnumConstraint\Constraints\Enum;
+
+#[
+    Enum(
+        enumType: ContactCategory::class,
+        multiple: true
+    )
+]
+public ?array $categories = null;
+```
+Also supports validating multiple given values