Ip (#133)

* add the ip service

* update readme

ip/proto/ip.proto

@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package ip;
+
+option go_package = "./proto;ip";
+
+service Ip {
+	rpc Lookup(LookupRequest) returns (LookupResponse) {}
+}
+
+// Lookup the geolocation information for an IP address
+message LookupRequest {
+	string ip = 1;
+}
+
+message LookupResponse {
+	string ip = 1;
+	int64 asn = 2;
+	string city = 3;
+	string country = 4;
+	double latitude = 5;
+	double longitude = 6;
+	string timezone = 7;
+}
+