added AuthInterceptor for sending api key in the header on every request to api

src/app/app.module.ts

@@ -1,5 +1,6 @@
 import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';
+import { HTTP_INTERCEPTORS, HttpClientModule } from '@angular/common/http';
 
 import { AppComponent } from './app.component';
 import { ContactSidebarComponent } from './contact-sidebar/contact-sidebar.component';
@@ -10,7 +11,8 @@ import { ProjectsComponent } from './projects/projects.component';
 import { BlogComponent } from './blog/blog.component';
 import { ContactComponent } from './contact/contact.component';
 import { AppRoutingModule } from './app-routing.module';
-import { HttpClientModule } from '@angular/common/http';
+import { AuthInterceptor } from './http-interceptors/auth.interceptor';
+import { httpInterceptorProviders } from './http-interceptors';
 
 @NgModule({
   declarations: [
@@ -29,7 +31,7 @@ import { HttpClientModule } from '@angular/common/http';
     AppRoutingModule
   ],
   schemas: [CUSTOM_ELEMENTS_SCHEMA],
-  providers: [],
+  providers: [httpInterceptorProviders],
   bootstrap: [AppComponent]
 })
 export class AppModule { }