Add instructions to readme

README.md

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-# Notion-Backup
+# Notion-Backup
+Backup all of your notion notes, and optionally upload them to a git repo.
+
+## Usage
+
+1. Create a folder where you want to export your notion notes to and optionally make it a git repo
+2. Run Notion-Backup executable, if you don't want to backup to a git repo append `nogit` to the end of the command (eg. `./Notion-Backup nogit`)
+3. (Happens only first time) Enter your API Token (look below on how to get it)
+4. (Happens only first time) Enter the path to the folder you created in step 1
+5. Done.. providing you have Git installed and it's in your PATH variable (if using git), Notion-Backup will do everything else for you
+
+## Getting your notion API Key
+
+1. Open `Inspect Element` (Ctrl+Shift+I) and go to the `Network tab`
+2. Refresh the page (whilst logged in) so network requests show up
+3. Click on the `first request` (most of the other requests will also work) and in the new menu click on `Cookies`
+4. In `Request Cookies` find `token_v2` and copy its value (eg. `token_v2:	"myTokenHere"` in this case, your token is: `myTokenHere`)
+5. If you don't see `token_v2`, click on a different request and then repeat step 4
+6. Done.. copy your API Token into Notion-Backup