Add contributing file, rename some files

src/lib/implicit.ts

@@ -0,0 +1,15 @@
+// Use this for passing state between pages implicitly
+const state = new Map<string, any>()
+
+export const setKey = <T>(key: string, value: T) => state.set(key, value)
+
+export const getKey = <T>(key: string) => state.get(key) as T | undefined
+
+export const popKey = <T>(key: string) => {
+  const value: T | undefined = state.get(key)
+
+  // Goofy hack due to sveltekit's double-rendering
+  setTimeout(() => state.delete(key), 300)
+
+  return value
+}