Create basic_start.md

Author: shafik

Diff for: basic_start.md

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+
+- A hosted implementation shall contain a global function called main in one of the specified forms *\[basic.start.main\]*
+    - 6.8.3.1
+    - Example:
+
+    ```cpp
+    void main() {}
+    ```
+    - Rationale:
+    
+    - Tools
+        - [Compiler static analysis, generates warnings or errors for void main](https://wandbox.org/permlink/9YlvHEA88lS0CbvV)
+
+- The function main shall not be used within a program   *\[basic.start.main\]*
+    - 6.8.3.1
+    - Examples:
+        - [Is it illegal to take address of main() function?](https://stackoverflow.com/q/15525613/1708801)
+        - [Why does gcc warn about decltype(main()) but not clang?](https://stackoverflow.com/q/25297257/1708801)
+        
+        ```cpp
+        printf( “%p\n”, &main ) ;
+        decltype(main()) x = 0;
+        ```
+        
+        ```cpp
+        int main() {
+          std::cout << reinterpret_cast<void*>(&main) ;
+        }
+        ```
+        
+    - Tools
+        - [Compiler static analysis via -pedantic flag gcc/clang for taking address of main](https://wandbox.org/permlink/atm7dJ1LXaVBkCsU)
+        - [Compiler static analysis via -pedantic flag gcc/clang decltype main](https://wandbox.org/permlink/WvPFbU4hteDOX4w2)
+
+    - Rationale: 
+        - From ARM section 3.4 Start and Termination
+            > This is to ensure full freedom of the implementation of the interface between a C++ program and its environment.
+            > One could imagine an implementation where main() was not implemented as a function.
+        - [\[ub\] What does "The function main shall not be used within a program" mean?](http://www.open-std.org/pipermail/ub/2014-January/000474.html)
+