updates references

readme

@@ -4,3 +4,8 @@
 203050048 Roshan Sahu 		sroshan@cse.iitb.ac.in          Solved: Q2, Q5
 Gitlab Link: https://git.cse.iitb.ac.in/sroshan/SpartanBotsAssignment3
 References
+[1]https://vds-admin.ru/sed-and-awk-101-hacks/chapter-3-regular-expressions
+[2]https://stackoverflow.com/
+[3]https://www.gnu.org/software/gawk/manual/gawk.html
+[4]https://www.math.utah.edu/docs/info/gawk_5.html
+[5]https://www.grymoire.com/Unix/Sed.html