Update README.md

Author: sparkcodegeeks1

README.md

@@ -30,3 +30,5 @@ Explanation of all PySpark RDD, DataFrame and SQL examples present on this proje
 - [Select columns from PySpark DataFrame ](https://sparkbyexamples.com/pyspark/select-columns-from-pyspark-dataframe/)
 - [PySpark Collect() – Retrieve data from DataFrame](https://sparkbyexamples.com/pyspark/pyspark-collect/)
 - [PySpark withColumn to update or add a column](https://sparkbyexamples.com/pyspark/pyspark-withcolumn/)
+- [PySpark using where filter function ](https://sparkbyexamples.com/pyspark/pyspark-where-filter/)
+- [PySpark – Distinct to drop duplicate rows ](https://sparkbyexamples.com/pyspark/pyspark-distinct-to-drop-duplicates/)