Create mutex-layout-and-boiler-plate.md

initial version of "mutex-layout-and-boiler-plate.md".

src/arc-mutex/mutex-layout-and-boiler-plate.md

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+# Layout & Boilerplate
+First we should make a layout for our mutex. The minimum would be a Boolean to store if the mutex is locked or not and an Unsafe Cell to store the actual value inside the mutex. For now, we can use the following layout:
+
+    use core::cell::UnsafeCell;
+    use core::sync::atomic::{AtomicBool,Ordering};
+    
+    struct Mutex<T>{
+        is_locked:AtomicBool,
+        value:UnsafeCell,
+    }
+
+We also should fill out some boilerplate:
+
+    impl<T> Mutex<T>{
+        pub fn new(value:T)->Self{
+            Self{is_locked:AtomicBool::new(false),UnsafeCell::new(value)}
+        }
+         
+        pub fn get_mut(&mut self)->&mut T{
+            self.value.get_mut()
+        }
+         
+        pub fn into_inner(self)->T{
+            self.value.into_inner()
+        }
+    }
+And a sync impl:
+
+    impl<T:Send+Sync> Sync for Mutex<T>{}
+
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