Docs: we need a doc to introduce fixed-potential method

[WHUweiqingzhou]

Details

Call for a doc to introduce the fixed-potential method

Have you read the online manual http://abacus.deepmodeling.com/en/latest/

• Yes, I have read the online manual.

Task list for Issue attackers (only for developers)

• Identify the specific section of the documentation with the issue.
• Investigate the issue and determine the root cause.
• Research best practices and potential solutions for the identified issue.
• Update the documentation to address the issue, following the suggested improvement.
• Ensure the updated documentation adheres to the project's documentation standards.
• Test the updated documentation to ensure it is clear and accurate.
• Review and incorporate any relevant feedback from users or developers.
• Publish the updated documentation and notify the issue reporter.