[OPENVINO CODE] modify readme file to include fill-in-the-middle feature (#886)

* modifying readme file

* added gif file to show fill-in-the-middle feature

* update fill-in-middle-mode support steps in the readme

Author: kumarijy

modules/openvino_code/README.md

@@ -51,9 +51,10 @@ In the docstring generation mode, various popular templates are available in the
 
 ### Fill in the Middle Mode
 
+![fill-in-the-middle](https://github.com/openvinotoolkit/openvino_contrib/assets/112030960/15ef3cbf-913b-46a5-b565-f1676ff7a0b7)
 
 1. Create a new Python file or open an existing one.
-1. Type `def main():` or place the cursor where you'd like middle text to be generated.
+1. Place the cursor where you'd like middle text to be generated or a line of code to be generated.
 1. Press the keyboard shortcut `Ctrl+Alt+Space` (`Cmd+Alt+Space` for macOS) or click the `Generate Code Completion` button located in the side panel.
 1. You can select the text then generate the related code.
 1. You may also right-click on "Generate Inline Code Completion In New Tab" to generate code in a new tab.