Add new configuration document for connection github

docs/reference/config-files/connection/github.md

@@ -0,0 +1,38 @@
+---
+title:  github
+sidebar_label: github
+---
+
+# github
+
+The `github` connection can be used to access GitHub resources.
+
+```hcl
+connection "github" "my_gh_token" {
+  token = "ghpat-..."
+}
+```
+
+## Arguments
+
+| Name            | Type    | Required?| Description
+|-----------------|---------|----------|-------------------
+| `token`         |  String | Optional | API access token
+
+All arguments are optional, and a `github` connection with no arguments will behave the same as the [default connection](#default-connection).
+
+## Attributes (Read-Only)
+
+| Attribute       | Type    | Description
+|-----------------|---------|-----------------
+| `env`           | Map     | A map of the resolved connection-related environment variables (`GITHUB_TOKEN`)
+
+## Default Connection
+
+The `github` connection type includes an implicit, default connection (`connection.github.default`) that will be configured to set the `token` to the `GITHUB_TOKEN` environment variable.
+
+```hcl
+connection "github" "default" {
+  token = env("GITHUB_TOKEN")
+}
+```