feat: update contributing guide

Author: notwindstone

README.md

@@ -29,6 +29,15 @@ If you want to add a new locale:
 - use [ISO 639-1](https://ru.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B8%D1%81%D0%BE%D0%BA_%D0%BA%D0%BE%D0%B4%D0%BE%D0%B2_ISO_639-1) code names
 - create `your-lang-code.json` file in `public/translations/` and fill the translations & info
 - add `your-lang-code` data in `src/constants/locales.ts`
+- the English translations are located in `src/locales/en.json` (also read the README file in that folder)
+
+### Building
+
+```shell
+git clone https://github.com/FreesmTeam/website
+bun i
+bun dev
+```
 
 ### Repositories
 
@@ -54,4 +63,4 @@ Thank you to all the people who have contributed!
 
 <!-- Variables -->
 
-[repo-card]: https://github-readme-stats.vercel.app/api/pin/?username=freesmteam&repo=freesmlauncher&bg_color=0c0c13&text_color=ffffff&title_color=f5c2e7&icon_color=f5c2e7&border_radius=8&hide_border=true
+[repo-card]: https://github-readme-stats.vercel.app/api/pin/?username=freesmteam&repo=freesmlauncher&bg_color=0c0c13&text_color=ffffff&title_color=f5c2e7&icon_color=f5c2e7&border_radius=8&hide_border=true

src/locales/README.md

@@ -1,3 +1,3 @@
 This folder contains only bundled translations. You should use `/public/translations` for adding your own locale.
 
-Also, you need to re-select your locale if you changed translations while being in `dev` mode. This happens because translations are fetched in runtime and saved in `localStorage`.
+Also, you need to re-select your locale if you changed translations while being in `dev` mode. This happens because translations are fetched in runtime and cached in `localStorage`.