Update README.md

README.md

+# Pthreads Lab
+
+*topics*
+* Pthread functions
+* Race condition
+* Condition Variables
+
+*Some Useful links:*
+* http://cs241.cs.illinois.edu/coursebook/Threads
+* https://computing.llnl.gov/tutorials/pthreads/#Abstract
+* https://www.youtube.com/watch?v=Y1PF0fE-v9M&ab_channel=IITBombayJuly2018 
+* https://www.youtube.com/watch?v=uA8X5zNOGw8&list=PL9IEJIKnBJjFZxuqyJ9JqVYmuFZHr7CFM&index=1
+
+
+## Compile Pthead programs
+To compile your code using make, edit Makefile to specify program name 
+```
+$ make
+```
+## Run Pthread programs
+```
+$ make run
+```
+## Clean Pthread programs
+```
+$ make clean
+```