update README.md.

Signed-off-by: 山东大学-刘明宏 <liuminghong@mail.sdu.edu.cn>

README.md

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 2.  Installing COMSOL
  The authors recommend installing the latest version of the software.
 
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 #### 运行说明 Run Instructions
 
 1.  Start COMSOL Multiphysics with MATLAB.
@@ -29,3 +31,4 @@ The authors recommend installing the latest version of the software.
 #### 如何引用 How to Cite
 
  The paper was submitted to Computers & Geosciences under the title "efficient geophysical modeling techniques for complex real geological structures".
+### 标题