chore(build): creating default superset_text.yaml placeholder file

superset_text.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+
+# To set the images of your preferred database, you may create a mapping here with engine and locations of the relevant images. The image can be hosted locally inside your static/file directory or online (e.g. S3)
+
+# DB_IMAGES:
+#   postgresql: "path/to/image/postgres.jpg"
+#   bigquery: "path/to/s3bucket/bigquery.jpg"
+#   snowflake: "path/to/image/snowflake.jpg"