Create README.md

Author: absognety

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+# Interview Experience for Data Engineer (Big Data) - 2021:  
+### First Round:  
++ What is Hive?  
++ What is Hive metastore?  
++ Hive external table vs managed table.  
++ evalute Programming skills - one question on that.  
++ mappers and reducers in Spark execution flow.  
++ what are `groupByKey` and `reduceByKey` operations in Spark.  
++ Write spark skeleton code for given scenario - reading a CSV and do some transformations on it - Code doesn't have to be exact but steps matter.  
++ Given a requirement, what are the steps to achieve it using only spark-sql without dataframes/RDDs API in spark?
++ Questions on SQL for window functions in spark (SQL query is preferred compared to Dataframes API).  
++ Different storage formats in big data space? questions on that (parquet, CSV, JSON, avro, delta etc).  
++ Questions on Hadoop ecosystem if any.