Create README.md

src/lang/README.md

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+# How to translate 
+
+(2023-01-24 Updated)
+
+1. Go to https://weblate.kuma.pet
+
+# How to add a new language in the dropdown
+
+1. Add your language at https://weblate.kuma.pet/projects/uptime-kuma/uptime-kuma/
+2. Find the language code (You can find it at the end of the URL)
+3. Go to https://github.com/louislam/uptime-kuma/blob/master/src/i18n.js and click `Edit` icon
+4. Add your language at the end of `languageList`, format: `"zh-TW": "繁體中文 (台灣)",`
+5. Commit and make a pull request for me to approve
+
+If you do not have programming skills, let me know in [the issues section](https://github.com/louislam/uptime-kuma/issues). I will assist you. 😏