Initial commit to create @actions/cache package

src/internal/contracts.d.ts

@@ -0,0 +1,25 @@
+import {CompressionMethod} from './constants'
+
+export interface ArtifactCacheEntry {
+  cacheKey?: string
+  scope?: string
+  creationTime?: string
+  archiveLocation?: string
+}
+
+export interface CommitCacheRequest {
+  size: number
+}
+
+export interface ReserveCacheRequest {
+  key: string
+  version?: string
+}
+
+export interface ReserveCacheResponse {
+  cacheId: number
+}
+
+export interface CacheOptions {
+  compressionMethod?: CompressionMethod
+}