Update index.md

Author: JustDeveloper1

docs/index.md

@@ -1 +1,41 @@
-coming soon.
+# _just
+
+_just - is a postprocessor that allows you to modify generated Next.js pages before publishing them to GitHub. <br>
+<small>Made for lazy devs.</small>
+
+---------
+# WHERE I CAN USE _JUST
+
+You can use **_just** only in your Next.js website on GitHub Pages.
+
+---------
+# HOW TO USE
+
+1. Create "`_just`" directory in root directory of your GitHub repository.
+2. Create "`js`", "`style`", "`dangerously-insert-files`" sub-directories in "`_just`" directory.
+3. Create "`404.html`" file that you can customize as you want and insert it in "`_just`" directory.
+4. You can add as many as you want JavaScript files in "`js`" sub-directory, these files will be applied to **all** pages on your website.
+5. You can add as many as you want CSS files in "`style`" sub-directory, these files will be applied to **all** pages on your website.
+6. If you want, you also can add **any** files in "`dangerously-insert-files`" sub-directory, these files will be available at `(PATH TO YOUR WEBSITE)/(FILE NAME)`.
+> [!WARNING]
+> INSERTING FILES DIRECTLY IN GENERATED NEXT.JS WEBSITE MAY CAUSE ERRORS.
+7. Now in your "`.github/workflows/nextjs.yml`" file insert this after "`Build with Next.js`":
+```yml
+      - name: _just
+        uses: JustDeveloper1/[email protected]
+```
+8. Change "`Upload artifact`" step's path to "`deploy`". It should look like:
+```yml
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: deploy
+```
+
+---------
+# BEST EXAMPLES
+
+If you want to take a look at websites and services that using _just, here is the best of them:
+> [Encoder.js](https://github.com/JustStudio7/Encoder) by [JustStudio.](https://github.com/JustStudio7)
+
+Think you are better? [Open an issue](https://github.com/JustDeveloper1/_just/issues/new) with requesting your project to be added in this list!