Update contributing docs

Author: ije

CONTRIBUTING.md

@@ -2,53 +2,61 @@
 
 Welcome, and thank you for taking time in contributing to esm.sh project!
 
-## Development setup
+## Development Setup
 
-You will need [Golang](https://golang.org/) 1.18+ and [Deno](https://deno.land) to run the server and tests.
+You will need [Golang](https://golang.org/)(1.21+) and [Deno](https://deno.land)(1.40+) installed on a Linux or macOS machine.
 
 1. Fork this repository to your own GitHub account.
 2. Clone the repository to your local device.
-3. Create a new branch `git checkout -b BRANCH_NAME`.
-4. Change code then run the testings.
+3. Create a new branch (`git checkout -b BRANCH_NAME`).
+4. Change code then run tests
 5. Push your branch to Github after **all tests passed**.
 6. Make a [pull request](https://github.com/esm-dev/esm.sh/pulls).
 7. Merge to master branch by our maintainers.
 
 ## Configration
 
-To configure the server, create a `config.json` file in the project root directory. Here is an example:
+Create a `config.json` file in the project root directory following the example below:
 
 ```jsonc
 // config.json
 {
   "port": 8080,
   "workDir": ".esmd",
-  "npmRegistry": "https://registry.npmjs.org",
-  "npmToken": "xxxxxx"
+  "npmRegistry": "https://registry.npmjs.org/", // change to your own registry if needed
+  "npmToken": "xxxxxx" // remove this line if you don't need a token
 }
 ```
 
-You can find all the server options in [config.exmaple.jsonc](./config.example.jsonc).
+More server options please check [config.exmaple.jsonc](./config.example.jsonc).
 
-## Run the sever in development mode
+## Running the Server from Source Code
 
 ```bash
 go run main.go --dev
 ```
 
 Then you can import `React` from "http://localhost:8080/react"
 
-## Run testings
+## Running Integration Tests
+
+We use [Deno](https://deno.land) to run all the integration tests. Make sure you have Deno installed on your machine.
 
 ```bash
 # Run all tests
-./test/bootstrap.sh
+./test/bootstrap.ts
 
-# Run tests for a specific case (directory name)
-./test/bootstrap.sh preact
+# Run a test for a specific case (directory name)
+./test/bootstrap.ts preact
 
 # Run tests with `clean` option (purge previous builds)
-./test/bootstrap.sh --clean
+./test/bootstrap.ts --clean
 ```
 
-All the tests are running in [Deno](https://deno.land), you can find them in [test/](./test) directory.
+To add a new integration test case, copy the [test/_template](./test/_template) directory and rename it to your case name.
+
+```bash
+cp -r test/_template test/case_name
+nvim test/case_name/test.ts
+./test/bootstrap.ts case_name
+```