Add new configuration document for connection ipstack (#106)

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

@@ -0,0 +1,32 @@
+---
+title: ipstack
+sidebar_label: ipstack
+---
+
+# ipstack
+
+The `ipstack` connection can be used to access IpStack resources.
+
+```hcl
+connection "ipstack" "my_ipstack" {
+  access_key = "1234801fakekeyf123455e6cfaf2"
+}
+```
+
+## Arguments
+
+| Name         | Type   | Required? | Description    |
+| ------------ | ------ | --------- | -------------- |
+| `access_key` | String | Optional  | API access key |
+
+All arguments are optional, and a `ipstack` connection with no arguments will behave the same as the [default connection](#default-connection).
+
+## Default Connection
+
+The `ipstack` connection type includes an implicit, default connection (`connection.ipstack.default`) that will be configured to set the `access_key` to the `IPSTACK_ACCESS_KEY` environment variable.
+
+```hcl
+connection "ipstack" "default" {
+  access_key = env("IPSTACK_ACCESS_KEY")
+}
+```