documentation changes for netezza (apache#15475)

README.md

@@ -121,6 +121,7 @@ Here are some of the major database solutions that are supported:
   <img src="superset-frontend/images/monet-db.png" alt="monet-db" border="0" width="106" height="46" />
   <img src="superset-frontend/images/apache-kylin.png" alt="apache-kylin" border="0" width="56" height="64"/>
   <img src="superset-frontend/images/hologres.png" alt="hologres" border="0" width="71" height="64"/>
+  <img src="superset-frontend/images/netezza.png" alt="netezza" border="0" width="64" height="64"/>
 </p>
 
 **A more comprehensive list of supported databases** along with the configuration instructions can be found

docs/src/pages/docs/Connecting to Databases/index.mdx

@@ -44,6 +44,7 @@ A list of some of the recommended packages.
 |[Google Sheets](/docs/databases/google-sheets)|```pip install shillelagh[gsheetsapi]```|```gsheets://```|
 |[Hologres](/docs/databases/hologres)|```pip install psycopg2```|```postgresql+psycopg2://<UserName>:<DBPassword>@<Database Host>/<Database Name>```|
 |[IBM Db2](/docs/databases/ibm-db2)|```pip install ibm_db_sa```|```db2+ibm_db://```|
+|[IBM Netezza Performance Server](/docs/databases/netezza)|```pip install nzalchemy```|```netezza+nzpy://<UserName>:<DBPassword>@<Database Host>/<Database Name>```|
 |[MySQL](/docs/databases/mysql)|```pip install mysqlclient```|```mysql://<UserName>:<DBPassword>@<Database Host>/<Database Name>```|
 |[Oracle](/docs/databases/oracle)|```pip install cx_Oracle```|```oracle://```|
 |[PostgreSQL](/docs/databases/postgresql)|```pip install psycopg2```|```postgresql://<UserName>:<DBPassword>@<Database Host>/<Database Name>```|

docs/src/pages/docs/Connecting to Databases/netezza.mdx

@@ -0,0 +1,18 @@
+---
+name: IBM Netezza Performance Server
+menu: Connecting to Databases
+route: /docs/databases/netezza
+index: 19
+version: 1
+---
+
+## IBM Netezza Performance Server
+
+The [nzalchemy](https://pypi.org/project/nzalchemy/) library provides a
+Python / SQLAlchemy interface to IBM Netezza Performance Server (aka Netezza).
+
+Here's the recommended connection string:
+
+```
+netezza+nzpy://{username}:{password}@{hostname}:{port}/{database}
+```