docs: update Twitter plugin README to match EVM plugin structure

packages/plugin-twitter/README.md

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+# `@elizaos/plugin-twitter`
+
+This plugin provides actions for posting tweets to Twitter/X using web automation.
+
+---
+
+## Configuration
+
+### Required Environment Variables
+
+Add the following credentials to your `.env` file:
+
+```env
+TWITTER_USERNAME=your-twitter-username
+TWITTER_PASSWORD=your-twitter-password
+TWITTER_EMAIL=your-email-address
+TWITTER_2FA_SECRET=your-2fa-secret-if-enabled
+```
+
+### Optional Settings
+
+Additional configuration options:
+
+```env
+# Enable dry run mode (logs tweets without posting)
+TWITTER_DRY_RUN=true
+
+# Enable premium features (removes 180 char limit)
+TWITTER_PREMIUM=true
+```
+
+## Provider
+
+The Twitter plugin doesn't include a provider, as it focuses on action-based interactions with Twitter.
+
+---
+
+## Actions
+
+### Post Tweet
+
+Posts tweets to Twitter/X with automatic content generation based on context. Features:
+
+- Automatic content generation based on conversation context
+- Character limit handling (180 chars, unless premium)
+- Dry run support for testing
+- Error handling and logging
+
+**Example usage:**
+
+```bash
+# These commands will trigger tweet generation and posting
+Tweet that
+Share this on Twitter
+Post this on X
+```
+
+---
+
+## Contribution
+
+The plugin contains TypeScript types and templates. Please ensure any contributions maintain type safety and follow the existing patterns.
+
+### Development
+
+To work on this plugin:
+
+```bash
+# Install dependencies
+pnpm install
+
+# Build the plugin
+pnpm build
+
+# Run tests (when implemented)
+pnpm test
+```
+
+### Templates
+
+The plugin uses a structured template system for tweet generation. See `src/templates.ts` for the tweet generation prompt structure.