Add initial implementation of did:cel tooling

.eslintrc.cjs

@@ -0,0 +1,12 @@
+module.exports = {
+  root: true,
+  env: {
+    node: true
+  },
+  extends: [
+    'digitalbazaar',
+    'digitalbazaar/jsdoc',
+    'digitalbazaar/module'
+  ],
+  ignorePatterns: ['node_modules/']
+};

.mocharc.cjs

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = {
+  spec: 'tests/mocha/*.js',
+  timeout: 120000,
+  reporter: 'spec'
+};