finish spinlock

README.md

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 ## Project #3: Implementing synchronization primitives
 
 ### *** Due on 11:59:59pm, June 12 (Friday)***
@@ -99,3 +100,7 @@ Implement the spinlock and blocking mutex that we learned in the class. And then
 
 - *THE INSTRUCTOR WILL NOT ANSWER THE QUESTIONS ABOUT THOSE ALREADY SPECIFIED ON THE HANDOUT.*
 - *QUESTIONS OVER EMAIL WILL BE IGNORED UNLESS IT CONCERNS YOUR PRIVACY.*
+=======
+# os-project3
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