Update README.md (alshedivat#1901)

Added new Q&A (Q7). Github credentials error when deploying. Changing
the github config url from `http` to `ssh`

README.md

@@ -469,6 +469,9 @@ If you have a different question, please ask using [Discussions](https://github.
    [specific characters](https://github.com/jekyll/classifier-reborn/issues/194) you used in your posts. Also, the calculus for similar posts are
    made for every `post`, which means every page that uses `layout: post`, including the announcements. To change this behavior, simply add
    `related_posts: false` to the front matter of the page you don't want to display related posts on.
+
+7. **Q:** When trying to deploy, it's asking for github login credentials, which github disabled password authentication and it exits with an error. How to fix?     <br>
+   **A:** Open .git/config file using your preferred editor. Change the `https` portion of the `url` variable to `ssh`. Try deploying again.
 
 ## Features