Add oso readme

packages/ethernaut-oso/README.md

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+# ethernaut-oso
+
+Tasks for interacting with Open Source Observer, a tool for tracking and analyzing the metrics of open source projects.
+
+## What
+
+This plugin adds a series of tasks that wrap the Open Source Observer API: https://docs.opensource.observer/docs/integrate/api
+
+## Installation
+
+```bash
+npm install ethernaut-oso
+```
+
+Import the plugin in your `hardhat.config.js`:
+
+```js
+require('ethernaut-oso')
+```
+
+Or if you are using TypeScript, in your `hardhat.config.ts`:
+
+```ts
+import 'ethernaut-oso'
+```
+
+## Required plugins
+
+This plugin doesn't depend on any other plugins.
+
+## Tasks
+
+This plugins adds the following tasks to hardhat:
+
+- chain Prints Open Source Observer onchain metrics for a project, including number of contracts, active users, gas usage, and more
+- code Prints Open Source Observer code metrics for a project, including number of Github stars, commits, contributors, and more
+- find Finds Open Source Observer projects by keyword, listing matches by name and slug
+
+## Environment extensions
+
+This plugin doesn't extend the hre.
+
+## Configuration
+
+This plugin doesn't add any fields to the hardhat configuration file.
+
+## Usage
+
+There are no additional steps you need to take for this plugin to work.