add the REUSE tool, not that this repo is compliant yet

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

requirements/requirements-dev.in

@@ -24,3 +24,6 @@ pip-tools                   # pip-compile
 tox<4                       # CI stuff
 tox-wheel                   # build wheels in tox
 versioneer                  # automatic version numbering
+
+# license/copyright tooling
+reuse

requirements/requirements-dev.txt

@@ -16,12 +16,22 @@ backports-tarfile==1.1.1
     # via jaraco-context
 bandit==1.7.8
     # via -r requirements/requirements-dev.in
+binaryornot==0.4.4
+    # via reuse
+boolean-py==4.0
+    # via
+    #   license-expression
+    #   reuse
 build==1.2.1
     # via pip-tools
 certifi==2024.2.2
     # via requests
 cffi==1.16.0
     # via cryptography
+chardet==5.2.0
+    # via
+    #   binaryornot
+    #   python-debian
 charset-normalizer==3.3.2
     # via requests
 click==8.1.7
@@ -112,7 +122,11 @@ jaraco-text==3.12.0
     #   irc
     #   jaraco-collections
 jinja2==3.1.3
-    # via safety
+    # via
+    #   reuse
+    #   safety
+license-expression==30.3.0
+    # via reuse
 markdown-it-py==3.0.0
     # via rich
 markupsafe==2.1.5
@@ -185,6 +199,8 @@ pytest-django==4.8.0
     # via -r requirements/requirements-dev.in
 python-dateutil==2.9.0.post0
     # via -r requirements/requirements.in
+python-debian==0.1.49
+    # via reuse
 python-mpd2==3.1.1
     # via -r requirements/requirements.in
 pytz==2024.1
@@ -197,6 +213,8 @@ pyyaml==6.0.1
     # via bandit
 requests==2.31.0
     # via safety
+reuse==3.0.2
+    # via -r requirements/requirements-dev.in
 rich==13.7.1
     # via
     #   bandit