add files for MDC-based MatProgressSpinner

Author: annieyw

src/material-experimental/mdc-progress-spinner/BUILD.bazel

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+@mixin mat-mdc-progress-spinner-color($config-or-theme) {}
+
+@mixin mat-mdc--progress-spinner-typography($config-or-theme) {}
+
+@mixin _mat-mdc-progress-spinner-density($config-or-theme) {}
+
+@mixin mat-mdc-progress-spinner-theme($theme-or-color-config) {}

src/material-experimental/mdc-progress-spinner/_progress-spinner-theme.scss

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export * from './public-api';

src/material-experimental/mdc-progress-spinner/index.ts

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {NgModule} from '@angular/core';
+import {MatCommonModule} from '@angular/material/core';
+import {MatProgressSpinner} from './progress-spinner';
+
+@NgModule({
+  exports: [MatProgressSpinner, MatCommonModule],
+  declarations: [MatProgressSpinner],
+})
+export class MatProgressSpinnerModule {
+}

src/material-experimental/mdc-progress-spinner/module.ts

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+WIP: MDC-based progress spinner

src/material-experimental/mdc-progress-spinner/progress-spinner.html

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ChangeDetectionStrategy, Component, ViewEncapsulation} from '@angular/core';
+
+@Component({
+  selector: 'mat-progress-spinner',
+  exportAs: 'matProgressSpinner',
+  templateUrl: 'progress-spinner.html',
+  styleUrls: ['progress-spinner.css'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  encapsulation: ViewEncapsulation.None,
+})
+export class MatProgressSpinner {}

src/material-experimental/mdc-progress-spinner/progress-spinner.scss

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export * from './checkbox';
+export * from './module';