Add Documentation

docs/ASK.md

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 <kbd><img src=https://codium.ai/images/pr_agent/ask.png width="768"></kbd>
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+## Ask lines
+You can run `/ask` on specific lines of code in the PR from the PR's diff view. The tool will answer questions based on the code changes in the selected lines.
+- Click on the + sign next to the line number to select the line.
+- To select multiple lines, click on the + sign of the first line and then hold and drag to select the rest of the lines. 
+- write `/ask "..."` in the comment box and press `Add single comment` button.
+
+<kbd><img src=https://codium.ai/images/pr_agent/Ask_line.png width="768"></kbd>
+
+
 Note that the tool does not have "memory" of previous questions, and answers each question independently.