Add core configuration files

jest.config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/test'],
+  testMatch: ['**/*.test.ts'],
+  moduleFileExtensions: ['ts', 'js', 'json'],
+  collectCoverageFrom: ['src/**/*.ts'],
+  coverageDirectory: 'coverage',
+  coverageReporters: ['text', 'lcov'],
+  verbose: true,
+  globals: {
+    'ts-jest': {
+      isolatedModules: true,
+      useESM: false
+    }
+  }
+};