Create Connect to data sources.md

Author: codehariom

Connect to data sources.md

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+These Streamlit snippets illustrate how to establish experimental connections and create a custom connection class:
+
+**Establishing connections:**
+
+    st.experimental_connection('pets_db', type='sql')
+sets up an experimental connection named 'pets_db' of type SQL.
+
+    conn = st.experimental_connection('sql')
+retrieves the experimental SQL connection.
+
+    conn = st.experimental_connection('snowpark')
+retrieves the experimental Snowpark connection.
+
+**Creating a custom connection class:**
+
+The code defines a custom connection class `MyConnection` inheriting from `ExperimentalBaseConnection[myconn.MyConnection]`.
+
+    _connect()
+method establishes a connection using custom parameters and returns an instance of `MyConnection`.
+
+    query()
+method executes a query using the connection instance.
+
+This code demonstrates Streamlit's experimental features for establishing and customizing connections to databases and other data sources.