DX: Add setup guide for using VS Code Dev Containers

.devcontainer/README.md

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+# Bitwarden Server Development with VS Code Dev Containers
+
+This guide helps you set up the Bitwarden Server development environment using VS Code Dev Containers. For more information, please refer to the [Server Setup Guide](https://contributing.bitwarden.com/getting-started/server/guide).
+
+## Prerequisites
+
+- [Visual Studio Code](https://code.visualstudio.com/)
+- [Dev Containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
+- [Docker Desktop](https://www.docker.com/products/docker-desktop/)
+- **Disable VPN**: If you use a VPN (e.g., Zscaler, Cloudflare WARP), temporarily disable it during container build as it can interfere with Docker's network access (the root cert is not trusted)
+
+## Quick Start
+
+### 1. Configure Environment Variables
+
+To avoid interactive prompts during container setup, create or update `dev/.env` with the following values:
+
+```bash
+# Copy the .env example file if it doesn't exist
+cp dev/.env.example dev/.env
+```
+
+Add these configuration variables to your `dev/.env` file:
+
+```bash
+SETUP_SECRETS_JSON=yes
+SETUP_AZURITE=no
+RUN_MSSQL_MIGRATIONS=no
+DEV_CERT_PASSWORD=*** # If you work at bitwarden, download the dev.pfx cert from the organisation vault, as described below
+INSTALL_STRIPE_CLI=no
+```
+
+```bash
+# Copy the secrets.json example file if it doesn't exist
+cp dev/secrets.json.example dev/secrets.json
+```
+
+**Important:** In `secrets.json` you'll need to configure:
+- Set a complex password for `MSSQL_SA_PASSWORD` (must follow [SQL Server password policy](https://docs.microsoft.com/en-us/sql/relational-databases/security/password-policy?view=sql-server-ver15) - basically: 8+ chars, uppercase, lowercase, digits, symbols)
+- Set the `globalSettings:installation:id` in your secrets.json file, it needs to be a valid guid, e.g. `00000000-0000-0000-0000-000000000000`.
+
+### 2. Choose Your Development Configuration
+
+#### For Internal Bitwarden Developers
+- Open the repository in VS Code
+- When prompted, select "Reopen in Container" or use Command Palette: `> Dev Containers: Reopen in Container`
+- Choose the **"Bitwarden Dev"** configuration
+
+This configuration is best fitted for Bitwarden employees.
+
+#### For Community Contributors
+- Open the repository in VS Code
+- When prompted, select "Reopen in Container" or use Command Palette: `Dev Containers: Reopen in Container`
+- Choose the **"Bitwarden Community Dev"** configuration
+
+This configuration is best fitted for community contributions.
+
+### 3. Container Setup Process
+
+The dev container will automatically:
+
+1. **Build the container** with all necessary dependencies
+2. **Start required services**:
+   - SQL Server (port 1433)
+   - Mail Catcher (port 1080)
+   - PostgreSQL (port 5432) 
+   - MySQL (port 3306)
+   - Azurite storage services (ports 10000-10002)
+3. **Run the post-creation script** which will prompt for (can be automated with values in the `.env`):
+   - Secrets.json configuration (copies values from the `secrets.json` to each project)
+   - Database migration execution
+   - Certificate setup
+   - Optional services (Azurite, Stripe CLI)
+
+## Other
+
+### Bitwarden Internal Development Certificate
+Place the `dev.pfx` file from the internal shared collection in the `dev/` directory, or set the `DEV_CERT_CONTENTS` environment variable with the base64-encoded certificate content.
+
+### Container Won't Start
+- Ensure Docker Desktop is running
+- **Disable VPN temporarily** - VPNs like Zscaler or Cloudflare WARP can block Docker's network access during build
+- Verify your `dev/.env` file has valid configuration values
+
+### Database Connection Issues  
+- Confirm your `MSSQL_SA_PASSWORD` meets complexity requirements
+- Check that the SQL Server container started successfully
+- Verify the connection string in your secrets.json matches your password
+
+### Certificate Issues
+- Ensure the `dev.pfx` file is present in the `dev/` directory
+- Verify you have the correct certificate password
+- Check that the dotnet certificate tool installed successfully
+
+For additional help, refer to the [Server Setup Guide](https://contributing.bitwarden.com/getting-started/server/guide) in the Contributing Documentation.