This commit introduces a new "Learn Spark in Y Minutes" guide in the format of LearnXinYMinutes documentation. The guide provides a concise overview of Apache Spark using PySpark, following repository style guidelines and including examples of basic Spark operations. Key sections cover:
- Initializing a Spark session
- Creating and manipulating DataFrames
- Applying transformations and actions
- Performing SQL queries
- Reading from and writing to various file formats
- Working with RDDs
- Ending a Spark session
