add a template module and boilerplate (#30)

* add a template module and boilerplate

* add CONTRIBUTING.md (#31)

* Update .sample/README.md

Co-authored-by: Ben Potter <me@bpmct.net>

* swap screenshot and code sample

---------

Co-authored-by: Ben Potter <me@bpmct.net>

.sample/README.md

@@ -0,0 +1,64 @@
+---
+display_name: MODULE_NAME
+description: Describe what this module does
+icon: ../.icons/<A_RELEVANT_ICON>.svg
+maintainer_github: GITHUB_USERNAME
+verified: false
+tags: [community]
+---
+
+# MODULE_NAME
+
+<-- Describes what this module does -->
+
+<-- Add a screencast or screenshot here -->
+
+```hcl
+module "MODULE_NAME" {
+    source = "https://registry.coder.com/modules/MODULE_NAME"
+}
+```
+
+## Examples
+
+### Example 1
+
+Install the Dracula theme from [OpenVSX](https://open-vsx.org/):
+
+```hcl
+module "MODULE_NAME" {
+    source = "https://registry.coder.com/modules/MODULE_NAME"
+    agent_id = coder_agent.example.id
+    extensions = [
+        "dracula-theme.theme-dracula"
+    ]
+}
+```
+
+Enter the `<author>.<name>` into the extensions array and code-server will automatically install on start.
+
+### Example 2
+
+Configure VS Code's [settings.json](https://code.visualstudio.com/docs/getstarted/settings#_settingsjson) file:
+
+```hcl
+module "MODULE_NAME" {
+    source = "https://registry.coder.com/modules/MODULE_NAME"
+    agent_id = coder_agent.example.id
+    extensions = [ "dracula-theme.theme-dracula" ]
+    settings = {
+        "workbench.colorTheme" = "Dracula"
+    }
+}
+```
+
+### Example 3
+
+Run code-server in the background, don't fetch it from GitHub:
+
+```hcl
+module "MODULE_NAME" {
+    source = "https://registry.coder.com/modules/MODULE_NAME"
+    agent_id = coder_agent.example.id
+    offline = true
+}