Update Lesson3HW2.java
Create BinSum.java
Create Lesson4HW1
Create Lesson4HW2
Create Lesson4HW3
Create Lesson4HW11.java
Create Lesson4HW12.java
Create Lesson4HW13.java
Create equals.java
Create MinMaxSum.java
Create IndexMaxPositive.java
Create SwapTwoElements.java
Directories tree changes

'misc' directory contains all miscellaneous files (c, java learning)
Priority Queue based on ArrayList
Merge origin/master