docs: add FAQ to the user guide

docs/user_guide/index.md

@@ -241,3 +241,33 @@ The `create-theme` command has some options:
 ```bash
 rendercv create-theme "mycustomtheme" --based-on "THEME_NAME"
 ```
+
+## Frequently Asked Questions (FAQ)
+
+### Can I use custom fonts?
+
+To be answered.
+
+### Can I add a background image?
+
+To be answered.
+
+### How good is it in terms of parseability by ATS?
+
+To be answered.
+
+### How to add links?
+
+To be answered.
+
+### How to use Greek letters?
+
+To be answered.
+
+### Can I add a profile picture?
+
+To be answered.
+
+### How can I switch the order of `company` and `position` in ExperienceEntry?
+
+To be answered.