add table to main readme

README.md

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 # `labeller`
+
+Currently, this package has the following commands:
+
+| Command | Description |
+| --- | --- |
+| [labeller](https://lsms-worldbank.github.io/labeller/reference/labeller.html) | Package command with utilities for the rest of the package
+| [lbl_assert_no_long_varlbl](https://lsms-worldbank.github.io/labeller/reference/lbl_assert_no_long_varlbl.html) | Assert that there is no variable in memory whose variable length exceeds the desired character length. |
+| [lbl_assert_no_pipes](https://lsms-worldbank.github.io/labeller/reference/lbl_assert_no_pipes.html) | Asserts that no variable labels have any pipes |
+| [lbl_assert_varlbls](https://lsms-worldbank.github.io/labeller/reference/lbl_assert_varlbls.html) | List variables without a variable label. |
+| [lbl_list_long_varlbl](https://lsms-worldbank.github.io/labeller/reference/lbl_list_long_varlbl.html) | List variables whose variable label is longer than the desired character length. |
+| [lbl_list_matching_vars](https://lsms-worldbank.github.io/labeller/reference/lbl_list_matching_vars.html) | Identify variables whose label matches a pattern. |
+| [lbl_list_matching_vals](https://lsms-worldbank.github.io/labeller/reference/lbl_list_matching_vals.html) | List value labels whose labels match a pattern. |
+| [lbl_list_no_varlbl](https://lsms-worldbank.github.io/labeller/reference/lbl_list_no_varlbl.html) | List variables without a variable label. |
+| [lbl_list_pipes](https://lsms-worldbank.github.io/labeller/reference/lbl_list_pipes.html) | Lists pipes in variable labels from Survey Solutions. |
+| [lbl_replace_pipe](https://lsms-worldbank.github.io/labeller/reference/lbl_replace_pipe.html) | Replaces pipes in variable labels with user-provided value |