Add Changelog.md

Changelog.md

@@ -0,0 +1,21 @@
+# Changelog
+
+## Upcoming Changes
+
+## 0.1.1
+
+Implement setting the time format string with the `--time-format=<time format string>` arg.
+
+## 0.1.0
+
+Implementation of info output for use by swaybar.
+
+By default, displays the date, load-avg, and memory usage.
+
+Network stats can be shown with the `--netdev=<device>` arg.
+
+Arbitrary output from a command can be shown with the `--regex-cmd=<cmd>[SPLIT]<args...>[SPLIT]<regex>` arg.
+
+The update interval in seconds can be set with the `--interval-sec=<seconds>` arg.
+
+Battery stats display can be enabled with the `--acpi-builtin` arg.