add user guide page stubs

docs/user_guide/access.md

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+# Access
+
+**Access** includes downloading files from a NASA DAAC or Earthdata Cloud to a local computer, a laptop, workstation or the storage space for a high-performace-computer (HPC); and also streaming data.
+
+
+## Downloading data
+
+
+## Streaming data

docs/user_guide/authenticate.md

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+# Authentication
+
+Introduces the `earthaccess.login` method for managing Earthdata Login and cloud credentials.

docs/user_guide/overview.md

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+# Overview
+
+`earthaccess` enables authentication, search and access for NASA Earth science data.  The package enables users to find, and download or stream data archived both at NASA DAACs and in the AWS-hosted Earthdata Cloud.  The User Guide introduces these three functions.
+
+The [Authentication](user_guide/authentication.md) section shows how `earthaccess` can be used to manage Earth Data Login and also Earthdata Cloud credentials.
+
+The [Search](user_guide/search.md) section introduces how to search for NASA datasets (collections) and specific data granules.
+
+The [Access](user_guide/access.md) section introduces how to use `earthaccess` to download data to a local machine or stream data by opening it directly in memory.
+
+Additional usage information can be found in the User Reference section.  The How-To sections contains short code examples for specific workflows.  Longer tutorials for working with particular datasets are in the Tutorials section.
+
+The Glossary section contains definitions for NASA terminology and Cloud computing.

docs/user_guide/search.md

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+# Search
+
+## `search_datasets`
+
+## `search_data`