Issue #3426505: Add composer.json file

Closes #3426505

composer.json

+{
+  "name": "drupal/field_hidden",
+  "description": "The Field Hidden module defines hidden field widgets for several core field types.",
+  "type": "drupal-module",
+  "license": "GPL-2.0-or-later",
+  "keywords": ["Drupal"],
+  "homepage": "https://www.drupal.org/project/field_hidden",
+  "authors": [
+    {
+      "name": "Jacob Friis Mathiasen (jacobfriis)",
+      "homepage": "https://www.drupal.org/u/jacobfriis",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Amit Sedai (amitsedaiz)",
+      "homepage": "https://www.drupal.org/u/amitsedaiz",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Oleksandr Kuzava (nginex)",
+      "homepage": "https://www.drupal.org/u/nginex",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Istvan Reszler-Fekete (reszli)",
+      "homepage": "https://www.drupal.org/u/reszli",
+      "role": "Maintainer"
+    }
+  ],
+  "minimum-stability": "dev",
+  "support": {
+    "issues": "https://www.drupal.org/project/issues/field_hidden",
+    "source": "https://git.drupalcode.org/project/field_hidden"
+  },
+  "require": { }
+}