chore(docs): default settings

apps/ngrid-demo-app/content/features/grid/default-settings.md

@@ -0,0 +1,46 @@
+---
+title: Default Settings
+path: features/grid/default-settings
+parent: features/grid
+ordinal: 3
+---
+# Default Setting
+
+The grid is configurable, either through `@Input` properties or directly through the grid instance. This is also valid for grid plugins (both built-in and third party).
+
+In most cases, all of the configurations comes with default settings but you can define your own defaults as well.
+
+To define a default configuration we use the `PblNgridConfigService` service:
+
+```typescript
+import { NgModule } from '@angular/core';
+import { PblNgridConfigService } from '@pebula/ngrid';
+
+@NgModule({ /** Module definition here... */ })
+export class MyRootModule {
+
+  constructor(gridConfig: PblNgridConfigService) {
+    gridConfig.set('table', {
+      showHeader: true,
+      showFooter: true,
+      noFiller: true,
+    });
+
+    // automatically enable target events plugin on all grids.
+    // Eliminates the need to use the `[targetEvents]` directive.
+    gridConfig.set('targetEvents', {
+      autoEnable: true
+    });
+
+  }
+}
+
+```
+
+The `set` methods accepts 2 parameters, the 1st is the name of the settings group and the 2nd parameter is the settings object for that group.
+
+The grid's core settings are under the `table` group name, other plugins might add additional groups
+
+I> There is no need to define `PblNgridConfigService` in the providers, it is done by the grid's module.
+
+I> For plugins, the plugin author is responsible for adding the support for default settings assignment, they might choose not to do it or allow partial settings to be applied.