docs: improved metadata in pyproject.toml

Author: ErikBjare

pyproject.toml

@@ -1,8 +1,8 @@
 [tool.poetry]
 name = "activitywatch"
 version = "0.12.0"
-description = ""
-authors = ["Erik Bjäreholt <erik@bjareho.lt>"]
+description = "The free and open-source automated time tracker. Cross-platform, extensible, privacy-focused."
+authors = ["Erik Bjäreholt <erik@bjareho.lt>", "Johan Bjäreholt <johan@bjareho.lt>"]
 license = "MPL-2.0"
 
 [tool.poetry.dependencies]