ts_102221: Add "resume_uicc" command

We've had a "suspend_uicc" command since commit
ec95053249bc7f9308ca1f659d8ef6ac97a6e393 in 2021, but didn't yet
have the corresponding "resume" pair.

Note that you cannot really execute this in a reasonable way from
within pySim, as it is required to power-cycle the card
between SUSPEND and RESUME, see TS 102 221 Section 11.1.22.3.2

Change-Id: I3322fde74f680e77954e1d3e18a32ef5662759f2
diff --git a/docs/shell.rst b/docs/shell.rst
index 8f85246..cce790a 100644
--- a/docs/shell.rst
+++ b/docs/shell.rst
@@ -217,6 +217,20 @@
    :module: pySim.ts_102_221
    :func: CardProfileUICC.AddlShellCommands.suspend_uicc_parser
 
+resume_uicc
+~~~~~~~~~~~
+This command allows you to perform the SUSPEND UICC command for the RESUME operation on the card.
+
+Suspend/Resume is a relatively recent power-saving addition to the UICC specifications, allowing for
+suspend/resume while maintaining state, as opposed to a full power-off (deactivate) and power-on
+(activate) of the card.
+
+The pySim command just sends that SUSPEND UICC (RESUME) command and doesn't perform the full related
+sequence including the electrical power down.
+
+.. argparse::
+   :module: pySim.ts_102_221
+   :func: CardProfileUICC.AddlShellCommands.resume_uicc_parser
 
 
 pySim commands