moved the common settings to a file

src/core/settings.ts

@@ -0,0 +1,14 @@
+import { IBuildAgent, SetupFields, ISetupSettings } from "./models";
+
+export class Settings {
+
+    public static getSetupSettings(buildAgent: IBuildAgent): ISetupSettings {
+        const versionSpec = buildAgent.getInput(SetupFields.versionSpec);
+        const includePrerelease = buildAgent.getBooleanInput(SetupFields.includePrerelease);
+
+        return {
+            versionSpec,
+            includePrerelease
+        }
+    }
+}