docs: add common commands

docs/command-reference.md

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+---
+sidebar_position: 30
+---
+
+# Common REUSE CLI Commands
+
+## Check for incompliant files (= not properly licensed)
+
+Run `pipx run reuse lint`
+
+## Add REUSE statements to a file
+
+Run `pipx run reuse annotate -c="<COPYRIGHT>" -l="<LICENSE-SPDX-IDENTIFIER>" <file>`
+
+Replace `<COPYRIGHT>` with the copyright holder, e.g "Deutsche Telekom AG", and `<LICENSE-SPDX-IDENTIFIER>` with the ID of the license the file should be under. For possible IDs see https://spdx.org/licenses/.
+
+## Add REUSE statements to a directory
+
+Run `pipx run reuse annotate -c "<COPYRIGHT>" -l "<LICENSE-SPDX-IDENTIFIER>" --recursive --skip-existing <directory>`
+
+## Add missing license texts to the repo
+
+Run `pipx run reuse download --all` to add license texts for all licenses detected in the project.
+
+## Get an SPDX file with all licensing information for this project (not for dependencies!)
+
+Run `pipx run reuse spdx`