init faq.md

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

docs/faq.md

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+## How do I convert a temporary session into a regular project?
+
+Temporary sessions are stored under `/tmp/spilltea/<random-id>/` and will be lost on reboot. To keep the data, move the directory into the Spilltea projects folder and give it a name.
+
+**1. Find the temporary session directory**
+
+```bash
+ls /tmp/spilltea/
+```
+
+You will see one or more directories with a random hex name (e.g. `a1b2c3d4`).
+
+**2. Move it to the projects folder**
+
+```bash
+mv /tmp/spilltea/<random-id> ~/.local/share/spilltea/<project-name>
+```
+
+The project name must only contain lowercase letters, digits, `-`, and `_`.
+
+**3. Open the project**
+
+```bash
+spilltea -P my-project
+```
+
+Or simply launch Spilltea and pick `my-project` from the project list.