docs: add a querying example into the main readme (googleapis#515)

Ilya Gurov · mf2199 · web-flow · commit c477cc283ab1 · 2020-09-29T15:11:52.000-04:00
* docs: add a querying example into the main readme

* Update README.rst

* Update README.rst

Co-authored-by: MF2199 &lt;38331387+mf2199@users.noreply.github.com&gt;
diff --git a/README.rst b/README.rst
@@ -74,10 +74,8 @@ Format
         },
     }
 
-Example
-~~~~~~~
-
-For example:
+Database configurations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. code:: python
 
@@ -90,6 +88,25 @@ For example:
         }
     }
 
+Execute a query
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code:: python
+
+    from google.cloud.spanner_dbapi import connect
+
+    connection = connect("instance-id", "database-id")
+    cursor = connection.cursor()
+
+    cursor.execute(
+        "SELECT *"
+        "FROM Singers"
+        "WHERE SingerId = 15"
+    )
+
+    results = cur.fetchall()
+
+
 Limitations
 -----------
 
