[ARROW-4103] [Documentation] Add README to docs/ root

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.12.0
• Component/s: Documentation
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20696
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 21/Dec/18 22:43
• Updated: 11/Jan/23 07:31
• Resolved: 26/Dec/18 20:50

Description

This should direct the user to instructions about how to build the documentation

Issue Links

• links to: GitHub Pull Request #3243
• links to: Github pull request #3248