Add template scaffolding script and enhance module script

[blink-so]

This PR addresses the request in #286 to add scaffolding for new templates.

Changes

• Added scripts/new_template.sh: New script for scaffolding templates similar to the existing module script
• Created examples/templates/: Example template files with comprehensive boilerplate including:
  • Terraform configuration with Coder provider setup
  • README template with proper frontmatter and documentation structure
  • Placeholder replacements for template names
• Enhanced scripts/new_module.sh: Now creates namespace directories automatically if they don't exist

Usage

# Create a new template
./scripts/new_template.sh my-namespace/my-template

# Create a new module (now with auto namespace creation)
./scripts/new_module.sh my-namespace/my-module

Testing

Both scripts have been tested and successfully:

• Create namespace directories when they don't exist
• Copy example files correctly
• Replace placeholders with actual names
• Set proper file permissions

Closes #286

[DevelopmentCats]

LGTM the only other thing I was thinking though, is it would be nice if in either the new_module or new_template script, it would be nice if in both scripts when its generating the namespace folder if it could also generate an example namespace README.md based on the coder namespace README as an example if it doesn't already exist.

[blink-so]

Great suggestion! I'll add namespace README.md generation to both scripts. Let me implement that now.

I'll use the coder namespace README as a template and create a generic version that gets populated when a new namespace is created.

[blink-so]

✅ Namespace README generation implemented!

What's new:

• Created examples/namespace/README.md template based on the coder namespace
• Both new_template.sh and new_module.sh now automatically generate namespace READMEs
• Only creates the README if the namespace doesn't already have one (won't overwrite existing)
• Replaces NAMESPACE_NAME placeholder with the actual namespace name

Example output when creating a new namespace:

$ ./scripts/new_template.sh my-company/docker-dev
Creating namespace directory: registry/my-company
Creating namespace README: registry/my-company/README.md
Template scaffolded successfully at registry/my-company/templates/docker-dev

The generated README includes frontmatter with display_name, bio, github, avatar, etc. - all ready for customization by the namespace owner.