update README

Author: allisonwang-db

README.md

@@ -50,6 +50,7 @@ spark.readStream.format("fake").load().writeStream.format("console").start()
 | [StockDataSource](pyspark_datasources/stock.py)                        | `stock`        | Batch Read     | Read stock data from Alpha Vantage           | None                  | `pip install pyspark-data-sources`<br/>`spark.read.format("stock").option("symbols", "AAPL,GOOGL").option("api_key", "key").load()`                                                                  |
 | **Batch Write** | | | | | |
 | [LanceSink](pyspark_datasources/lance.py)                              | `lance`        | Batch Write    | Write data in Lance format                    | `lance`               | `pip install pyspark-data-sources[lance]`<br/>`df.write.format("lance").mode("append").save("/tmp/lance_data")`                                                                                          |
+| [SimpleJsonDataSource](pyspark_datasources/simplejson.py)              | `simplejson`   | Batch Write    | Write JSON data to Databricks DBFS           | `databricks-sdk`      | `pip install pyspark-data-sources[simplejson]`<br/>`df.write.format("simplejson").save("/path/to/output")`                                                                                               |
 | **Streaming Read** | | | | | |
 | [OpenSkyDataSource](pyspark_datasources/opensky.py)                 | `opensky`      | Streaming Read | Read from OpenSky Network.                   | None                  | `pip install pyspark-data-sources`<br/>`spark.readStream.format("opensky").option("region", "EUROPE").load()`                                                                                            |
 | [WeatherDataSource](pyspark_datasources/weather.py)                    | `weather`      | Streaming Read | Fetch weather data from tomorrow.io           | None                  | `pip install pyspark-data-sources`<br/>`spark.readStream.format("weather").option("locations", "[(37.7749, -122.4194)]").option("apikey", "key").load()`                                          |