Update README.md

Author: fangjian19

README.md

@@ -1,20 +1,34 @@
-The OpenCFD software series is a high-precision computational fluid dynamics (CFD) software developed by the team led by Li Xinliang at the Institute of Mechanics, Chinese Academy of Sciences. 
+The OpenCFD software series is a high-precision computational fluid dynamics (CFD) software developed by the team led by Li Xinliang at the Institute of Mechanics, Chinese Academy of Sciences.
+
 It includes the high-accuracy finite difference software OpenCFD-SC (formerly Hoam-OpenCFD), 
+
 the multi-block structured grid finite volume software OpenCFD-EC,
+
 the high-accuracy simulation software for chemically reactive flows OpenCFD-Comb, 
+
 and the GPU heterogeneous parallel high-precision computation software OpenCFD-SCU. 
+
 The developers have made this software available for use by scientific research and engineering users.
 
 code change log
  2021-03-15: OpenCFD Ver2.0
+ 
  2021-03-17: OpenCFD Ver 2.0a, New feature in shock sensor and hybrid schemes
+ 
  2021-03-22: OpenCFD Ver 2.0b, a bug in du_inviscous_Character is removed Local Lax-Friedrichs splitting is added
+ 
  2021-04-05: OpenCFD Ver 2.0c, a bug in read-flate.f90 is remove boundary condition (random disturbance) is added in OCFD_Bc_boundarylayers.f90
+ 
  2021-04-20: OpenCFD Ver 2.1, bounary condition of swept-corner is added
+ 
  2021-05-03: OpenCFD Ver 2.1a, NND-type Boundary scheme is added
+ 
  2021-05-10: OpenCFD Ver 2.1b, boundary condition of swept-corner is modified
+ 
  2021-06-08: OpenCFD Ver 2.2, Ghost-Cell type boundary condition is supported Small revision in OCFD2d_flux1( ) ,  OCFD2d_flux2( )  and flux_charteric( ), to inprove efficient (fast 4%)
+ 
  2021-06-14: OpenCFD Ver 2.2a, Symmetry side-boundary  swept-corner is supported
+ 
  2021-06-22: OpenCFD ver 2.2b, 2nd-order exterpolation Ghost Cell coordinates