Added type declaration file

src/index.d.ts

@@ -0,0 +1,25 @@
+declare module '@vtfk/logger' {
+  export type Levels = 'silly' | 'debug' | 'verbose' | 'info' | 'warn' | 'error'
+
+  export function logger (
+    level: Levels,
+    message: string[] | string
+  ): void
+
+  export function logConfig(
+    options?: LogConfigOptions
+  ): void
+
+  interface LogConfigOptions {
+    remote?: {
+      onlyInProd?: boolean
+      host?: string
+      port?: string
+      serviceHostname?: string
+      serviceAppname?: string
+    }
+    prefix?: string
+    suffix?: string
+    localLogger?: (message: any) => void
+  }
+}