add some examples for plot PDOS and PBANDS

Author: jiyuang

tools/plot-tools/abacus_plot/band.py

@@ -756,7 +756,7 @@ def plot(self,
 if __name__ == "__main__":
     import matplotlib.pyplot as plt
     from pathlib import Path
-    parent = Path(r"C:\Users\YY.Ji\Desktop\Si")
+    parent = Path(r"../examples/Si")
     name = "PBANDS_1"
     path = parent/name
     fig, ax = plt.subplots(figsize=(12, 6))

tools/plot-tools/abacus_plot/dos.py

@@ -517,7 +517,7 @@ def plot(self,
     #                     energy_range=energy_range, dos_range=dos_range, notes={'s': '(a)'})
     # fig.savefig("tdos.png")
 
-    pdosfile = r"C:\Users\YY.Ji\Desktop\Si\PDOS"
+    pdosfile = r"../examples/Si/PDOS"
     pdos = PDOS(pdosfile)
     #species = {"Ag": [2], "Cl": [1], "In": [0]}
     atom_index = {1: {1: [0, 1]}}

tools/plot-tools/examples/Si/README

@@ -11,9 +11,9 @@ NiteL
 (1) The input files of this example is chosen from ABACUS/examples/02(c-d). Extra parameter "out_proj_band" for 
 PBANDS calculation is needed in 02c.
 
-(3) It is recommended that one use a script to parse PDOS and PBANDS, or you can do it by `python band.py` and `python dos.py` directly. 
+(2) It is recommended that one use a script to parse PDOS and PBANDS, or you can do it by `python band.py` and `python dos.py` directly. 
 
-(2) There is a bug when use command-line to parse PBANDS: 
+(3) There is a bug when use command-line to parse PBANDS: 
 ```
 Traceback (most recent call last):
   File "F:\software\Anaconda\Scripts\abacus-plot-script.py", line 33, in <module>