feat: add form dialog component (#428)

- Add formfield, input, select base (model)
- Add formfield component
- Add form-group service
- Add form-dialog component

Fixes: #427

src/app/shared/form-dialog/form-group.service.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@angular/core';
+import { FormControl, FormGroup, Validators } from '@angular/forms';
+
+import { FormfieldBase } from './formfield/model/formfield-base';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class FormGroupService {
+
+  constructor() { }
+
+  createFormGroup(formfields: FormfieldBase[]) {
+    const group: any = {};
+
+    formfields.forEach(formfield => {
+      group[formfield.controlName] = formfield.required ? new FormControl(formfield.value, Validators.required) : new FormControl(formfield.value);
+    });
+
+    return new FormGroup(group);
+  }
+
+}