Add @koa/cors based on kcors (#20310)

types/koa__cors/index.d.ts

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+// Type definitions for @koa/cors 2.2
+// Project: https://github.com/koajs/cors
+// Definitions by: Xavier Stouder <https://github.com/Xstoudi>, Izayoi Ko <https://github.com/izayoiko>, Steve Hipwell <https://github.com/stevehipwell>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node"/>
+
+import * as Koa from "koa";
+
+export = cors;
+
+declare function cors(options?: cors.Options): Koa.Middleware;
+
+declare namespace cors {
+    interface Options {
+        origin?: ((req: Koa.Request) => string) | string;
+        allowMethods?: string[] | string;
+        exposeHeaders?: string[] | string;
+        allowHeaders?: string[] | string;
+        maxAge?: number | string;
+        credentials?: boolean;
+        keepHeadersOnError?: boolean;
+    }
+}

types/koa__cors/koa__cors-tests.ts

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+import Koa = require('koa');
+import cors = require('@koa/cors');
+
+const app = new Koa();
+app.use(cors());

types/koa__cors/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths":{
+            "@koa/cors": ["koa__cors"]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "koa__cors-tests.ts"
+    ]
+}

types/koa__cors/tslint.json

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+{ "extends": "dtslint/dt.json" }