chore: add info from README.md to contributing.md

CONTRIBUTING.md

@@ -4,9 +4,13 @@ Hi! We are really excited that you are interested in contributing to Elk. Before
 
 Refer also to https://github.com/antfu/contribute.
 
-## Set up your local development environment
+### Online
 
-The package manager used to install and link dependencies must be [pnpm](https://pnpm.io/) (Note: on Linux in a standard Node 16+ environment, you should follow the instructions to install via Node's `corepack` rather than using the `curl` command).
+You can use [StackBlitz Codeflow](https://stackblitz.com/codeflow) to fix bugs or implement features. You'll also see a Codeflow button on PRs to review them without a local setup. Once the elk repo has been cloned in Codeflow, the dev server will start automatically and print the URL to open the App. You should receive a prompt in the bottom-right suggesting to open it in the Editor or in another Tab. To learn more, check out the [Codeflow docs](https://developer.stackblitz.com/codeflow/what-is-codeflow). 
+
+[![Open in Codeflow](https://developer.stackblitz.com/img/open_in_codeflow.svg)](https://pr.new/elk-zone/elk)
+
+### Local Setup
 
 To develop and test the Elk package:
 
@@ -14,18 +18,33 @@ To develop and test the Elk package:
 
 2. Ensure using the latest Node.js (16.x)
 
-3. Elk uses pnpm v7, you must enable [Corepack](https://github.com/nodejs/corepack) by running `corepack enable`.
+3. The package manager used to install and link dependencies must be [pnpm](https://pnpm.io/) v7. To use it you must first enable [Corepack](https://github.com/nodejs/corepack) by running `corepack enable`. (Note: on Linux in a standard Node 16+ environment, you should follow the instructions to install via Node's `corepack` rather than using the `curl` command)
 
 4. Check out a branch where you can work and commit your changes:
 ```shell
 git checkout -b my-new-branch
 ```
 
-5. Run `pnpm i` in Elk's root folder
+1. Run `pnpm i` in Elk's root folder
 
-6. Run `pnpm nuxi prepare` in Elk's root folder
+2. Run `pnpm nuxi prepare` in Elk's root folder
 
-7. Run `pnpm dev` in Elk's root folder to start dev server or `pnpm dev:mocked` to start dev server with `@elkdev@universeodon.com` user.
+3. Run `pnpm dev` in Elk's root folder to start dev server or `pnpm dev:mocked` to start dev server with `@elkdev@universeodon.com` user.
+
+We recommend installing [ni](https://github.com/antfu/ni#ni), that will use the right package manager in each of your projects. If `ni` is installed, you can instead run:
+
+```
+ni
+nr dev
+```
+
+### Testing
+
+Elk uses [Vitest](https://vitest.dev). You can run the test suite with:
+
+```
+nr test
+```
 
 ### Running PWA on dev server
 

README.md

@@ -23,7 +23,7 @@ A nimble Mastodon web client
   </a>
 </p>
 
-> ⚠️ **Elk is in Alpha**
+## ⚠️ Elk is in Alpha
 
 It is already quite usable, but it isn't ready for wide adoption yet. We recommend you use it if you would like to help us build it. We appreciate your feedback and contributions. Check out the [Open Issues](https://github.com/elk-zone/elk/issues) and jump in the action. Join the [Elk discord server](https://chat.elk.zone) to chat with us and learn more about the project.