feat: add TextWidget

add TextWidget CRUD api

add basic tests for API

cmd/curl_post_text_widget_anon.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# this should fail as no token is provided
+# user is not authenticated
+# no token has been granted
+
+URL='http://127.0.0.1:8000/api/text-widgets'
+
+curl -X POST \
+     -H "Accept: application/json" \
+     -H "Content-Type: application/json" \
+     -d '{
+           "title": "Yet Another New Entry Title",
+           "content": "This is the content yet again of the new entry."
+         }' \
+     $URL