feat: initial nodejs client, with notify and identify calls

Author: cjbell

.gitignore

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+.npmrc
+node_modules
+yarn-error.log
+dist

.prettierignore

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+dist

.prettierrc

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+{
+  "singleQuote": false,
+  "trailingComma": "all"
+}

LICENSE

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+MIT License
+
+Copyright (c) 2021 Knock Labs, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Knock Node.js library
+
+Knock API access for applications written in server-side Javascript.
+
+## Documentation
+
+See the [documentation](https://docs.knock.app) for Node.js usage examples.
+
+## Installation
+
+```bash
+npm install @knocklabs/node
+```
+
+## Configuration
+
+To use the library you must provide a secret API key, provided in the Knock dashboard.
+
+You can set it as an environment variable:
+
+```bash
+KNOCK_API_KEY="sk_12345"
+```
+
+Or, you can set it before your application starts:
+
+```javascript
+const Knock = require("@knocklabs/node");
+
+const knockClient = new Knock("sk_12345");
+```

jest.config.js

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+module.exports = {
+  clearMocks: true,
+  resetMocks: true,
+  restoreMocks: true,
+  verbose: true,
+  testEnvironment: "node",
+  testPathIgnorePatterns: ["/node_modules/", "/dist/"],
+  roots: ["<rootDir>/src"],
+  transform: {
+    "^.+\\.ts?$": "ts-jest",
+  },
+};