Add documentation for backend dev env data source setup (#2636)

docs/open-source-community/developer/backend/README.md

@@ -18,6 +18,10 @@ We use Java for developing OpenMetadata backend server. Following are the key te
 [code-generation.md](code-generation.md)
 {% endcontent-ref %}
 
+{% content-ref url="env-setup.md" %}
+[env-setup.md](env-setup.md)
+{% endcontent-ref %}
+
 {% content-ref url="debugging.md" %}
 [debugging.md](debugging.md)
-{% endcontent-ref %}
+{% endcontent-ref %}

docs/open-source-community/developer/backend/env-setup.md

@@ -0,0 +1,51 @@
+# Dev Environment Setup
+
+This document guides you through setting up the dev environment for OpenMetadata backend. 
+
+Most of us developers on OpenMetadata use [IntelliJ IDEA](https://www.jetbrains.com/idea/) for backend development.
+
+## Setting up the Project
+
+TODO
+
+## Database Connection Setup
+
+Ensure that the local mysql docker container is running from the previous step.
+
+```bash
+$ docker ps -a
+CONTAINER ID   IMAGE                                                  COMMAND                  CREATED        STATUS                     PORTS                                                                                  NAMES
+cb89f6085688   openmetadata/db:latest                                 "/entrypoint.sh mysq…"   17 hours ago   Up 17 hours (healthy)      0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060-33061/tcp                             local-metadata_mysql_1
+```
+
+Open the database tool from IntelliJ IDEA View menu.
+
+![Database Tool](../../../.gitbook/assets/db-tool.png)
+
+Set up the data source using the [database credentials](https://github.com/open-metadata/OpenMetadata/blob/main/docker/local-metadata/mysql-script.sql) that was used to spin up the openmetadata/db docker container.
+The configuration should look like the one described in the screenshot below:
+
+Test Connection before proceeding to the next step.
+
+![Data Source Setup](../../../.gitbook/assets/setup-connection.png)
+
+After the data source is set up, you'll be able to see the tables in the IntelliJ Database tool.
+
+![Data Source Setup](../../../.gitbook/assets/browse-db.png)
+
+With the data source setup, you are now able to run queries against OpenMetadata's local MySQL database.
+
+![Run SQL Queries](../../../.gitbook/assets/run-sql-query.png)
+
+Alternatively, you may log in to the docker container and run SQL queries directly with the mysql client:
+```bash
+$ docker exec -it local-metadata_mysql_1 bash -c 'mysql -uopenmetadata_user -popenmetadata_password -Dopenmetadata_db'
+
+mysql>  SELECT COUNT(*) FROM role_entity;
++----------+
+| COUNT(*) |
++----------+
+|        2 |
++----------+
+1 row in set (0.02 sec)
+```