fix(core): initial, support creation of rsa keypairs

ts/smartcrypto.classes.smartcrypto.ts

@@ -0,0 +1,17 @@
+import * as plugins from './smartcrypto.plugins';
+
+export class Smartcrypto {
+  public static async createRSAKeyPair(): Promise<plugins.nodeForge.pki.KeyPair> {
+    const done = plugins.smartpromise.defer<plugins.nodeForge.pki.KeyPair>();
+    const rsa = plugins.nodeForge.pki.rsa;
+    rsa.generateKeyPair({bits: 2048, workers: 2}, (err, keypair) => {
+      if (err) {
+        console.log(err);
+        throw err;
+      }
+      done.resolve(keypair);
+      // keypair.privateKey, keypair.publicKey
+    }); 
+    return done.promise;
+  }
+}