pulumi-whoami: add page (#14729)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/pulumi-whoami.md

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+# pulumi whoami
+
+> Print information about the currently logged in user.
+> More information: <https://www.pulumi.com/docs/iac/cli/commands/pulumi_whoami/>.
+
+- Print the username of the currently logged in user:
+
+`pulumi whoami`
+
+- Print detailed information about the currently logged in user:
+
+`pulumi whoami {{-v|--verbose}}`
+
+- Print detailed information about the currently logged in user as JSON:
+
+`pulumi whoami {{-j|--json}}`
+
+- Display help:
+
+`pulumi whoami {{-h|--help}}`