update readme

README.md

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 Image Caption Slapper is a python script used to put caption on a image with viral funny video style
 | before | after |
 |--------|-------|
-|![sample](sample.png)|![edited](edit.png)|
+|![sample](sample.png)|![edited](edit.png)|
+
+## How to use
+You can run the python file through CLI, down below are the options you can use
+
+| commands  | description | required |
+|-----------|-------------|----------|
+| --path -p | image path  | True     |
+| --text -t | text to put in the image | True   |
+| --out -o  | output file name, auto generated if not specified|  False |