write skeleton of functions

src/signature.ts

@@ -0,0 +1,13 @@
+export type PrivKey = void
+export type PubKey = void
+export type Signature = string
+
+export function gen_keypair() : [PrivKey, PubKey] {
+    throw "todo"
+}
+export function sign(privkey: PrivKey, message: Uint8Array) : Signature {
+    throw "todo"
+}
+export function verify(pubkey: PubKey, message: Uint8Array, signature: Signature) : boolean {
+    throw "todo"
+}