feat(cmd): add support for CSV input in apply-users command

[k1LoW]

This pull request introduces support for importing users from a CSV file in addition to the existing JSONL format. The changes include updates to the documentation and modifications to the command-line tool to handle the new CSV format.

Documentation updates:

• README.md: Added a new section describing the CSV format for the users file and how to specify the columns using the --columns flag. [1] [2]

Code updates:

• cmd/applyUsers.go: Introduced a new variable cols to store the column definitions for the CSV format.
• cmd/applyUsers.go: Updated the applyUsersCmd command to parse users from a CSV file if the --columns flag is provided.
• cmd/applyUsers.go: Added a new flag --columns to define the columns for the CSV format.

[github-actions]

Code Metrics Report

	main (bdf563f)	#6 (7120add)	+/-
Coverage	0.0%	0.0%	0.0%
Code to Test Ratio	1:0.0	1:0.0	0.0
Test Execution Time	4s	7s	+3s

Details

  |                     | main (bdf563f) | #6 (7120add) | +/-  |
  |---------------------|----------------|--------------|------|
  | Coverage            |           0.0% |         0.0% | 0.0% |
  |   Files             |              5 |            5 |    0 |
  |   Lines             |            260 |          272 |  +12 |
  |   Covered           |              0 |            0 |    0 |
  | Code to Test Ratio  |          1:0.0 |        1:0.0 |  0.0 |
  |   Code              |            542 |          564 |  +22 |
  |   Test              |              0 |            0 |    0 |
- | Test Execution Time |             4s |           7s |  +3s |

Code coverage of files in pull request scope (0.0% → 0.0%)

Files	Coverage	+/-
cmd/applyUsers.go	0.0%	0.0%

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Reported by octocov