fix(readme): add info about the project

Signed-off-by: Sphericalkat <me@kat.bio>

README.md

@@ -1,6 +1,6 @@
-# create-svelte
+# Katstash
 
-Everything you need to build a Svelte project, powered by [`create-svelte`](https://github.com/sveltejs/kit/tree/main/packages/create-svelte).
+File storage and sharing service.
 
 ## Creating a project