add file hashes to doc

docs/source/input_data/index.rst

@@ -31,6 +31,67 @@ follow these steps:
 #. Fill out the information on the access request form to tell us about your project. You can simply put "Data access request" in the title field.
 #. We will get back to you after we receive your request!
 
+Validating pseudopeople input data
+----------------------------------
+
+The following table provides the SHA-256 checksum for the larger-scale input
+data zip files:
+
+.. list-table:: SHA-256 checksums
+  :header-rows: 1
+
+  * - Location
+    - File
+    - SHA-256 checksum
+  * - US
+    - pseudopeople_input_data_usa_1_0_0.zip
+    - 9462cc60b333fb2a3d16554a9e59b5428a81a2b1d2c34ed383883d7b68d2f89f
+  * - Rhode Island
+    - pseudopeople_input_data_ri_1_0_0.zip
+    - d3f1ccdfbfca8b53254c4ceeb18afe17c3d3b3fe02f56cc20d1254f818c39435
+
+These checksums can be used to validate that you've successfully
+downloaded the correct and uncorrupted zip file; if the SHA-256 checksum that
+you generate for the downloaded file matches the value provided above, you can
+be sure you downloaded the file successfully.
+
+Possibly the simplest way to verify checksums is to generate the value using the 
+terminal/cmd command below (be sure to replace `PATH/TO/ZIP`  with the actual path 
+to the zip you downloaded) and visually compare the result to the
+values provided above. Note that if even the first few and last few characters 
+match then it is very likely the entire string matches.
+
+Linux:
+
+.. code-block:: console
+
+  $ sha256sum PATH/TO/ZIP
+
+Mac:
+
+.. code-block:: console
+
+  $ shasum -a 256 PATH/TO/ZIP
+
+Windows:
+
+.. code-block:: console
+
+  $ CertUtil -hashfile PATH/TO/ZIP SHA256
+
+.. note::
+
+  Generating the checksum can take a long time for larger files, e.g. several
+  minutes for the Rhode Island dataset and ~1 hour for the United States dataset.
+
+If the generated checksum does not match the one provided in the table above,
+please try re-downloading the dataset.
+
+If after downloading the file a second time the checksums still do not match,
+please open a `Bug report <https://github.com/ihmeuw/pseudopeople/issues/new?assignees=&labels=&template=bug_report.yml>`_ 
+using the template under the `Issues tab <https://github.com/ihmeuw/pseudopeople/issues>`_ 
+on pseudopeople's GitHub page.
+
 Using pseudopeople input data
 -----------------------------