Update README.md

Author: absognety

SymphonyAI/README.md

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-Hackerrank Test (Personal Experience)  
-=====================================
+Hackerrank Test (Personal Experience) (2020) 
+===========================================
+______________________________________________________________________________________________
+
+# Interview Experience (NLP Systems Engineer) - 2021:  
+### First Round:  
++ Simple programming and statistics based questions using numpy,scipy etc.  
++ Quesitons on pyspark vs scala-spark
++ what kind of Data warehouse architecture are you using in your company? Questions on that as well.  
+
+### Second Round:  
++ Random forest vs XGBoost
++ Questions on decision tree internals.  
++ Model evaluation and selection techniques and questions on that involving confusion matrix etc.  
++ Model overfitting and Underfitting - How do you know?  
++ Questions on NLP project that you did.  
++ Programming question based on sorting without using any libraries or built-in functions.  
++ `inplace` and `axis` arguments in pandas apis.