Added docs for instance script & credentials datasource

docs/data-sources/ecloud_instance_credential.md

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+# ecloud_credential Data Source
+
+This resource represents an eCloud 
+
+## Example Usage
+
+```hcl
+data "ecloud_credential" "instance1_root" {
+  instance_id = "i-abcdef12"
+  username = "root"
+}
+```
+
+## Argument Reference
+
+- `instance_id`: (required) ID of the instance
+- `username`: Username of credential
+- `name`:   Name of credential
+
+## Attributes Reference
+
+`id` is set to host ID
+
+- `name`: Name of host
+- `username`: credential username
+- `password`: Credential password

docs/resources/ecloud_instance_script.md

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+# ecloud_instance_script Resource
+
+This resource is for managing eCloud Networks
+
+## Example Usage
+
+```hcl
+resource "ecloud_instance_script" "instance1_provision" {
+  instance_id = "i-abcdef12"
+  username = data.ecloud_credential.instance1_root.username
+  password = data.ecloud_credential.instance1_root.password
+  script = "somescript"
+}
+```
+
+## Argument Reference
+
+- `instance_id`: (Required) ID of instance
+- `username`: (Required) Instance user credential
+- `password`: (Required) Instance password credential
+- `script`: (Required) Script content