Update WORKLOG.md

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 # Compiler Construction PA1 Worklog
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 ## Team:
 <br>Apoorva Ranade(ar6496)
 <br>Sanjar Ahmadov(sa5640)
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 ## Indentation:
 - A stack is maintained by the lexer to keep track of indentations. A count is accumulated for the number of whitespace characters before the first token. If the count changes from the previous line count, a stack operation is performed. If count increases, another value is added to the stack. If count decreases, the topmost value is popped from the stack.
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 ## Challenges:
 - Shift-reduce errors while parsing the grammar. One approach to fix is to change the grammar. We chose to fix this issue by adding a precedence as in the case of expr by adding right precedence for if and else.
 - Handling errors was another challenge. This required debugging and small changes to program flow.