Switch to singleton act instance

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

src/settingsManager.ts

@@ -0,0 +1,19 @@
+export interface Environment {
+
+}
+
+export interface Secret {
+    key: string,
+    value?: string
+}
+
+export interface Variable {
+    key: string,
+    value?: string
+}
+
+export class SettingsManager {
+    environments: Environment[] = [];
+    secrets: Secret[] = [];
+    variables: Variable[] = [];
+}