feat: add loan charge to existing loan accounts (#370)

- Add Loans Module.
- Add add-loan-charge component.
- Add loans-routing.module.ts
- Add loan-charge-template.resolver.ts

Fixes: #247

src/app/loans/loans.service.ts

@@ -0,0 +1,32 @@
+/** Angular Imports */
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+
+/** rxjs Imports */
+import { Observable } from 'rxjs';
+
+/**
+ * Loans service.
+ */
+@Injectable({
+  providedIn: 'root'
+})
+export class LoansService {
+  constructor(private http: HttpClient) {}
+  /**
+   * @param {string} loanId loanId of the loan.
+   * @returns {Observable<any>}
+   */
+  getLoanChargeTemplateResource(loanId: string): Observable<any> {
+    return this.http.get(`/loans/${loanId}/charges/template`);
+  }
+
+  /**
+   * @param {any} loanCharge to apply on a Loan Account.
+   * @returns {Observable<any>}
+   */
+  createLoanCharge(loanId: string, resourceType: string, loanCharge: any): Observable<any> {
+    return this.http.post(`/loans/${loanId}/${resourceType}`, loanCharge);
+  }
+
+}