creating network and login services

common/entities/Error.ts

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+export class Error{
+
+}

common/entities/LoginCredential.ts

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+export class LoginCredential{
+    constructor(public username?:string, public password?:string){
+
+    }
+}

common/entities/Message.ts

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+import {Error} from "./Error";
+
+export class Message<T>{
+    constructor(public error:Error,public result:T){}
+}

common/entities/User.ts

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+export class User {
+    constructor(public name?:string,public email?:string, public password?:string){}
+}