More features (#9)

* added config file implementation, refactoring
* add gitignore
* improved test
* preperations for more metrics
* added resource metrics
* added first bgp metrics
* added asn as label for bgp metrics
* added prefix and message counts to bgp metrics
* simplified
* Update README.md
* added yaml dependency
* fixed go routine call
* added timeout
* clean up
* added TLS support
* set default api port for TLS
* added routes metric
* added missing log information
* added type collectorContext to reduce the count of parameters for better readability
* added DHCP and DHCPv6 metrics
* filter for active dhcp leases only
* added pool metrics
* enable/disable feature in config file
* refactoring

* clean up

* comment fix

collector/routeros_collector.go

@@ -0,0 +1,10 @@
+package collector
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type routerOSCollector interface {
+	describe(ch chan<- *prometheus.Desc)
+	collect(ctx *collectorContext) error
+}