Update readme.txt

readme.txt

+Git: darshanp
+Link:https://git.cse.iitb.ac.in/darshanp/Team_DePReSs_week-2/ 
+
+Contribution:
+qn1: Sandeep(203050083)
+qn2: Rajiv(203059003)
+qn3: Darshan(203059005)
+qn4: Piyush(203050055)
+
+References:
+q1:
+https://www.tutorialspoint.com/unix/unix-basic-operators.htm
+https://www.tutorialspoint.com/unix/unix-shell-loops.htm
+
+q2:
+https://linuxconfig.org/bash-scripting-tutorial-for-beginners
+https://www.geeksforgeeks.org/regular-expression-grep/
+http://faculty.salina.k-state.edu/tim/unix_sg/shell/variables.html#:~:text=Arguments%20or%20variables%20may%20be,third%20argument%2C%20etc...
+https://opensource.com/article/20/6/bash-functions
+
+q3:
+https://www.softwaretestinghelp.com/grep-command-in-unix/
+https://ubuntu-maryland.org/presentations/reference_bash-cheat.pdf
+
+q4:
+https://stackoverflow.com/questions/12916352/shell-script-read-missing-last-line
+https://stackoverflow.com/questions/10929453/read-a-file-line-by-line-assigning-the-value-to-a-variable
+https://www.tecmint.com/sort-command-linux/