Added schematics for ng add command.

projects/ngx-spinner/package.json

@@ -1,6 +1,7 @@
 {
   "name": "ngx-spinner",
   "version": "8.1.0",
+  "schematics": "./schematics/collection.json",
   "repository": {
     "type": "git",
     "url": "https://github.com/Napster2210/ngx-spinner.git"
@@ -45,4 +46,4 @@
     "@angular/common": "^8.0.0",
     "@angular/core": "^8.0.0"
   }
-}
+}

projects/ngx-spinner/schematics/collection.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "../../../node_modules/@angular-devkit/schematics/collection-schema.json",
+  "schematics": {
+    "ng-add": {
+      "description": "Add ngx-spinner to the project.",
+      "factory": "./ng-add/index#ngAdd"
+    }
+  }
+}

projects/ngx-spinner/schematics/ng-add/index.ts

@@ -0,0 +1,10 @@
+import { Rule, SchematicContext, Tree } from '@angular-devkit/schematics';
+import { NodePackageInstallTask } from '@angular-devkit/schematics/tasks';
+
+// Just return the tree
+export function ngAdd(_options: any): Rule {
+  return (tree: Tree, _context: SchematicContext) => {
+    _context.addTask(new NodePackageInstallTask());
+    return tree;
+  };
+}