added installation guide

2026-03-27 16:11:16 +05:00
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+# Day 0 — Claude Code Setup
+
+This guide walks you through installing Claude Code on your machine and authenticating so you can start using it.
+
+## Step 1: Install Claude Code
+
+Choose your operating system:
+
+| OS | Guide |
+|----|-------|
+| Windows | [windows.md](windows.md) |
+| Linux | [linux.md](linux.md) |
+| macOS | [mac.md](mac.md) |
+
+Follow the guide for your OS, then come back here for authentication.
+
+---
+
+## Step 2: Verify Installation
+
+After following your OS-specific guide, confirm everything is working:
+
+```bash
+node --version    # Should show v18.x or higher
+claude --version  # Should show the installed Claude Code version
+```
+
+---
+
+## Step 3: Login
+
+<img src="assets/login.png" alt="Claude Code login screen" width="50%">
+
+Run `claude` in your terminal. On first launch, it will ask you to choose a login method.
+
+### Method 1: Subscription (Claude Pro / Max)
+
+- Select **Claude.ai account**
+- Browser opens — sign in and authorize
+- Return to terminal, you're logged in
+
+### Method 2a: API Key (Team Invite)
+
+Your team admin invites you from the Anthropic dashboard.
+
+- You receive an **invite email** — accept it and create your Anthropic account
+- Run `claude` in your terminal
+- Select **Anthropic API Key**
+- Your key is **auto-generated** on the dashboard — no manual setup needed
+- Claude Code starts working immediately
+
+### Method 2b: API Key (You have the key)
+
+If someone shared the key with you (via Slack, email, etc.) or you created your own:
+
+- Run `claude` in your terminal
+- Select **Anthropic API Key**
+- Paste your key (starts with `sk-ant-`)
+- The key is **stored permanently** — you won't be asked again
+
+---