feat: add snjs package

packages/snjs/lib/Services/Session/SessionsClientInterface.ts

@@ -0,0 +1,8 @@
+import { ClientDisplayableError } from '@standardnotes/responses'
+import { Base64String } from '@standardnotes/sncrypto-common'
+
+export interface SessionsClientInterface {
+  createDemoShareToken(): Promise<Base64String | ClientDisplayableError>
+
+  populateSessionFromDemoShareToken(token: Base64String): Promise<void>
+}