Add services as submodules

.gitmodules

+[submodule "api-gateway"]
+	path = api-gateway
+	url = https://github.com/hornerj94/api-gateway
+[submodule "authentication-service"]
+	path = authentication-service
+	url = https://github.com/hornerj94/authentication-service
+[submodule "dummy-service"]
+	path = dummy-service
+	url = https://github.com/hornerj94/dummy-service
+[submodule "eureka-server"]
+	path = eureka-server
+	url = https://github.com/hornerj94/eureka-server

api-gateway @ 605a3e88

+Subproject commit 605a3e881fce4cf46c391c4b1570f19c3a5d1124

authentication-service @ 49e4c106

+Subproject commit 49e4c106ea4cd50b200ef0f9c7ab82b20584745b

dummy-service @ 98328dee

+Subproject commit 98328dee2dfde68eee0bba63972827e8f50f111e

eureka-server @ 8992c8c5

+Subproject commit 8992c8c51bc878ae9c4703b7e1646887f7aee86f