update readme

README.md

 # seispy
 
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-Python module of seismology and receiver functions
+Seispy is a Python module for processing seismological data and calculating Receiver Functions. The advanced functions are available to improve the Obspy.
+
 
 # Installation
 ## Dependencies
@@ -19,7 +20,8 @@ Python module of seismology and receiver functions
   * [PyQt5](https://www.riverbankcomputing.com/software/pyqt/)
   
 ## Installation
-```Python
+```
+git clone https://github.com/xumi1993/seispy.git
 python setup.py install
 ```
 
@@ -30,10 +32,13 @@ python setup.py install
   * `seispy.geo`: Tiny codes of geophysics.
   * `seispy.bootstrap`: Bootstrap confidence interval estimation (by [scikits-bootstrap](https://github.com/cgevans/scikits-bootstrap))
   * `seispy.decov`: Iterative time domain deconvolution method (Ligorria and Ammon's 1999 BSSA)
+  * `seispy.rfcorrect`: Subsequent process of PRFs includeing moveout correct and time to depth conversion (1D and 3D) (see Mijian Xu et al., 2018 EPSL)
+  * `seispy.ccp`: CCP stacking along a profile.
+
 
 ## Commands
  * `prf`: Calculate PRFs for a station.
- * `pickrf`: Pick PRFs after the calculation.
+ * `pickrf`: Reject PRFs with poor qualities after the calculation.
  * `plotrt`: Plot PRFs in R and T components order by back-azimuth.
  * `plotr`: Plot PRFs in R component order by back-azimuth.
  * `hk`: H-Kappa stacking.