add limit by

pdb-js/src/app/app.module.ts

@@ -10,12 +10,16 @@ import { MainPageComponent } from './main-page/main-page.component';
 import { HelpPageComponent } from './help-page/help-page.component';
 import { UploadPageComponent } from './upload-page/upload-page.component';
 import { VisualizationPageComponent } from './visualization-page/visualization-page.component';
- 
+
+import {MatAutocompleteModule} from '@angular/material/autocomplete'; 
+import {MatButtonModule} from '@angular/material/button';
+import {MatCheckboxModule} from '@angular/material/checkbox';
 import {MatSelectModule} from '@angular/material/select';
-import {MatAutocompleteModule} from '@angular/material/autocomplete';
 import {MatFormFieldModule, MatInputModule} from '@angular/material';
+import {MatTooltipModule} from '@angular/material/tooltip';
 import { YAxisRangeComponent } from './y-axis-range/y-axis-range.component';
 import { QueryAutocompleteComponent } from './query-autocomplete/query-autocomplete.component';
+import { LimitByComponent } from './limit-by/limit-by.component';
 
 @NgModule({
   declarations: [
@@ -26,14 +30,20 @@ import { QueryAutocompleteComponent } from './query-autocomplete/query-autocompl
     VisualizationPageComponent,
     YAxisRangeComponent,
     QueryAutocompleteComponent,
+    LimitByComponent,
   ],
   imports: [
     BrowserModule,
     AppRoutingModule,
     FormsModule,
     ReactiveFormsModule,
-    MatSelectModule,MatFormFieldModule, MatInputModule,
     MatAutocompleteModule,
+    MatButtonModule,
+    MatCheckboxModule,
+    MatFormFieldModule,
+    MatInputModule,
+    MatSelectModule,
+    MatTooltipModule,
     BrowserAnimationsModule,
     HttpClientModule
   ],