chore(readme): Add instructions for using cf-run

Author: Mukundan314

README.md

@@ -28,6 +28,50 @@ cd python-codeforces
 pip install -e .
 ```
 
+## Using `cf-run`
+
+```shell
+cf-run [contestId] [index] [program]
+```
+
+Example:
+
+```shell
+$ gcc a.c -o ./out
+$ cf-run 1100 A ./out
+A. Roman and Browser
+time limit per test: 1 second
+memory limit per test: 256 megabytes
+
+-------------------------------------------------------------------------------- 
+
+Time: 16 ms
+
+Input
+4 2
+1 1 -1 1
+
+Participant's output
+2
+
+Jury's answer
+2
+
+-------------------------------------------------------------------------------- 
+
+Time: 19 ms
+
+Input
+14 3
+-1 1 -1 -1 1 -1 -1 1 -1 -1 1 -1 -1 1
+
+Participant's output
+9
+
+Jury's answer
+9
+```
+
 ## Documentation
 
 Documentation can be found at https://python-codeforces.readthedocs.io/en/latest/