Create how-to-access-data.md

Adding new file that provides links  for users seeking to access or download HuBMAP data

docs/how-to-access-data.md

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+# Access & Download HuBMAP Data
+
+## How can I Access and Download Data?
+
+Access to most* <i>published</i> data on <a href="https://portal.hubmapconsortium.org/">HuBMAP's Data Portal</a> is open to all interested viewers. <br />
+You can search for these datasets, view them, and download them, without additional barriers (account creation, login, etc.).
+- Find data using faceted search - <a href="https://portal.hubmapconsortium.org/search?entity_type[0]=Dataset">Explore datasets</a>.
+- <a href="https://portal.hubmapconsortium.org/cells">Explore by biological entities</a> (organs, molecules, or cell types).
+- Preview and <a href="https://portal.hubmapconsortium.org/search?entity_type[0]=Dataset">Download datasets</a> via Globus.
+  - All options (above) include built-in tutorials.</li>
+
+<b>*Note:</b> An <i>exception</i> to this is raw genetic data. Downloading this type of HuBMAP data requires NIH approval.
+
+## Sequencing (Raw Genetic) vs. Other Datasets
+- When you browse HuBMAP datasets that contain sequencing data, you won't be able to download those (directly) from the HuBMAP Data Portal.
+- When you browse other datasets on the Portal, you will see a link to download those published datasets.
+  - HuBMAP requires that sequencing (raw genetic) data be submitted to NIH's dbGaP.
+  - Go to <a href="https://dbgap.ncbi.nlm.nih.gov/aa/wga.cgi?page=login">dbGaP's Data Download</a> management portal to learn...
+    - Who can apply for access to the data?
+    - How you can apply?
+    - Why access to this data is controlled
+    - Tips for preparing a successful Data Access Request
+    - How to get Additional Help
+  - You should also contact the <a href="mailto:help@hubmapconsortium.org">HuBMAP Helpdesk</a> for assistance with this process.
+  - Note that it can take <i>one or more weeks</i> to receive permission from dbGaP, once requested.