Added jest to sam

Author: dreamorosi

Diff for: examples/sam/jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  testEnvironment: 'node',
+  roots: ['<rootDir>/tests'],
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  }
+};