added Techstack to README

README.md

@@ -67,3 +67,17 @@ Other urls are:
 
 When you request a shared file directly, you can add anything after a dot behind the id e.g. `/s/jW8ADy.png`.
 This is done to make the browser display the file correctly. On the server side, this will be stripped away.
+
+# Tech stack
+
+## Backend 
+
+- Go
+- Minio s3 client
+- Mux
+
+## Frontend 
+
+- Svelte
+- Highlight.js
+- Typescript