Add button config metadata (#11)

* Add buttons to callback args.

* Use title instead of text.

src/addin/client-interfaces/addin-button-config.ts

@@ -0,0 +1,13 @@
+import { AddinButtonStyle } from './addin-button-style';
+
+/**
+ * Interface for defining configuration options for Button add-ins
+ */
+export interface AddinButtonConfig {
+
+  /**
+   * The style to use for the button
+   */
+  style?: AddinButtonStyle;
+
+}

src/addin/client-interfaces/addin-button-style.ts

@@ -0,0 +1,16 @@
+/*
+* Defines the style of the button
+*/
+export enum AddinButtonStyle {
+  // No style (default)
+  None = 0,
+
+  // The button represents an "add" operation
+  Add = 1,
+
+  // The button represents an "edit" operation
+  Edit = 2,
+
+  // The button represents a "delete" operation
+  Delete = 3
+}

src/addin/client-interfaces/addin-client-ready-args.ts

@@ -1,3 +1,5 @@
+import { AddinButtonConfig } from './addin-button-config';
+
 /**
  * Interface for informing the AddinClient that the add-in is ready.
  * Will dictate if and how the add-in should show in the host page.
@@ -14,4 +16,8 @@ export interface AddinClientReadyArgs {
    */
   title?: string;
 
+  /**
+   * Metadata used when displaying a button.
+   */
+  buttonConfig?: AddinButtonConfig;
 }