Create README.md

First pass at documenting these processes. Will need @FuhuXia or @btylerburton to round out the final section

config/data/README.md

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+# Adding an Organization to inventory.data.gov
+
+1. Log in to inventory, click `Organizations`, then `Add Organization` button.
+2. Fill out the `Name`, `Description`, and `Image` fields
+    1. If the org name is long, consider manually changing the URL to a shorter, logical string. Example: `Agricultural Research Service, Department of Agriculture` becomes inventory.data.gov/organization/ars-usda-gov
+3. Save the org
+4. If the new org is a sub-org of a larger agency/organization (meaning when the larger/main org exports a data.json file, the application will pull the data.json from the sub-org inventory and incorporate it into the final output), navigate to the **main** org page and click `Admin` 
+5. On main org `admin` page, either add a key of `sub-agencies` in the custom fields and add a `value` or edit the `value` field if the key already exists.
+    1. The value formatting should follow `org-url-id` and be comma-separated, such as `olm-doe,fossil-energy,cfo-energy-gov`
+
+# Adding Publishers to an Organization
+
+Without manually adding a publisher to an org, no publisher will appear in the dropdown when an inventory user creates a new dataset record.
+
+1. Open https://github.com/GSA/inventory-app/blob/main/config/data/inventory_publishers.csv and click `Edit this file`
+2. For a brand new org, add a row in the correct alphabetical spot
+    1. The first column should be the `org-url-id`, followed by the `Full Text Name of Main Org`, followed by (optionally) `Name of Sub-org` OR `Additional Publishers Desired in the Org`, comma-separated, and ending with `,,,,`
+    2. Examples: `nrel-gov,Department of Energy,National Renewable Energy Laboratory,,,,` OR `state-gov,Department of State,,,,,` OR `department-of-energy,Department of Energy,Office of Nuclear Energy,Idaho National Laboratory,,,`
+3. For an existing org, add a row that adds the new Publisher in the correct column of the hierarchy
+4. Create a Pull Request 
+
+Of note, any org (even a sub-org) in the inventory will need its own row with a publisher. A sub-org of DOE cannot just add a line in to the `department-of-energy` block, it must have its own row with its own org ID in the first column.
+
+# Adding Users to Inventory
+
+**Important Note**: Despite the inventory.data.gov UI providing buttons for an admin to `Add a User`, due to the integration with login.gov, adding users via the UI is no longer supported. Adding a user via the UI will only confuse SAML and cause issues.
+
+### Non-developer instructions:
+
+1. Fill out an issue to add a user at https://github.com/GSA/datagov-account-management/issues using the `New User Account` template
+2. Make sure the dropdown lists `inventory.data.gov` as the application
+3. Choose `Editor` permissions for any non-datagov team member
+
+### Developer instructions:
+
+1. TBD
+
+
+
+
+