add plugin for basher

plugins/available/basher.plugin.bash

@@ -0,0 +1,15 @@
+cite about-plugin
+about-plugin 'initializes basher, the shell package manager'
+
+# https://github.com/basherpm/basher
+
+if ! _command_exists basher; then
+	if [[ -x "$HOME/.basher/bin/basher" ]]; then
+		pathmunge "$HOME/.basher/bin"
+	else
+		_log_warning 'basher not found'
+		return 0
+	fi
+fi
+
+eval "$(basher init - bash)"