Added type declarations

types/spine.d.ts

@@ -0,0 +1,30 @@
+import Packaging from "./packaging";
+import Section from "./section";
+import Hook from "./utils/hook";
+
+export default class Spine {
+  constructor();
+
+  hooks: {
+    serialize: Hook,
+    content: Hook
+  };
+
+  unpack(_package: Packaging, resolver: Function, canonical: Function): void;
+
+  get(target?: string | number): Section;
+
+  each(...args: any[]): any;
+
+  first(): Section;
+
+  last(): Section;
+
+  destroy(): void;
+
+  private append(section: Section): number;
+
+  private prepend(section: Section): number;
+
+  private remove(section: Section): number;
+}