*Add files api

src/index.ts

@@ -47,6 +47,21 @@ export interface PluginAPI {
     set: (newRouter: express.Router) => void;
     reset: () => void;
   };
+  files: {
+    createIndependentFileSmall(
+      seed: Uint8Array,
+      userInode: string,
+      fileData: Uint8Array
+    ): Promise<[IndependentFileSmall, Err]>;
+    openIndependentFileSmall(
+      seed: Uint8Array,
+      userInode: string
+    ): Promise<[IndependentFileSmall, Err]>;
+    overwriteIndependentFileSmall(
+      file: IndependentFileSmall,
+      newData: Uint8Array
+    ): Promise<Err>;
+  };
   logger: Logger;
 }