README added for topo repo!

Author: PooriaNamyar

topo_repo/README.md

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+## Topology Repo
+
+**Jellyfish**  
+name format = jf\_R\_(switch radix)\_H\_(number of servers per switch)\_N\_(total servers). 
+ 
+**Xpander**  
+name format = fc\_R\_(switch radix)\_H\_(number of servers per switch)\_N\_(total servers).  
+
+**FatClique**  
+name format = xp\_R\_(switch radix)\_H\_(average number of servers per switch)\_N\_(total servers)\_p\_c\_(value of p\_c)\_s\_c\_(value of s\_c)\_s\_b\_(value of s\_b).  
+
+**Clos**  
+name format = Clos\_R\_(switch radix)\_N\_(total servers).  
+
+## References
+[1] Greenberg, A., Hamilton, J.R., Jain, N., Kandula, S., Kim, C., Lahiri, P., Maltz, D.A., Patel, P. and Sengupta, S., 2009, August. VL2: A scalable and flexible data center network. In Proceedings of the ACM SIGCOMM 2009 conference on Data communication (pp. 51-62). <br>
+
+[2] Singla, A., Hong, C.Y., Popa, L. and Godfrey, P.B., 2012. Jellyfish: Networking data centers randomly. In 9th {USENIX} Symposium on Networked Systems Design and Implementation ({NSDI} 12) (pp. 225-238). <br>
+
+[3] Singh, A., Ong, J., Agarwal, A., Anderson, G., Armistead, A., Bannon, R., Boving, S., Desai, G., Felderman, B., Germano, P. and Kanagala, A., 2015. Jupiter rising: A decade of clos topologies and centralized control in google's datacenter network. ACM SIGCOMM computer communication review, 45(4), pp.183-197. <br>
+
+[4] Valadarsky, A., Shahaf, G., Dinitz, M. and Schapira, M., 2016, December. Xpander: Towards optimal-performance datacenters. In Proceedings of the 12th International on Conference on emerging Networking EXperiments and Technologies (pp. 205-219). <br>
+
+[5] Zhang, M., Mysore, R.N., Supittayapornpong, S. and Govindan, R., 2019. Understanding lifecycle management complexity of datacenter topologies. In 16th {USENIX} Symposium on Networked Systems Design and Implementation ({NSDI} 19) (pp. 235-254). <br>
+