Add settings view

Signed-off-by: Sanjula Ganepola <sanjulagane@gmail.com>

src/views/settings/variables.ts

@@ -1,5 +1,7 @@
 import { ThemeIcon, TreeItem, TreeItemCollapsibleState } from "vscode";
+import { act } from "../../extension";
 import { GithubLocalActionsTreeItem } from "../githubLocalActionsTreeItem";
+import VariableTreeItem from "./variable";
 
 export default class VariablesTreeItem extends TreeItem implements GithubLocalActionsTreeItem {
     static contextValue = 'githubLocalActions.variables';
@@ -11,6 +13,8 @@ export default class VariablesTreeItem extends TreeItem implements GithubLocalAc
     }
 
     async getChildren(): Promise<GithubLocalActionsTreeItem[]> {
-        return [];
+        const workflows = await act.workflowsManager.getWorkflows();
+        const variables = [...new Set(workflows.map(workflow => act.settingsManager.getVariables(workflow)).flat())];
+        return variables.map(variable => new VariableTreeItem(variable));
     }
 }