Add golang package (#23)

diff --git a/browser/BrowserPerf.proto b/browser/BrowserPerf.proto
index b227f7e..1a3ca82 100644
--- a/browser/BrowserPerf.proto
+++ b/browser/BrowserPerf.proto
@@ -20,6 +20,7 @@
 
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.language.agent.v3";
+option go_package = "skywalking/network/language/agent/v3";
 
 import "common/Common.proto";
 
diff --git a/common/Common.proto b/common/Common.proto
index 270dfd2..5d7ca13 100644
--- a/common/Common.proto
+++ b/common/Common.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.common.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/common/v3";
 
 message KeyStringValuePair {
     string key = 1;
diff --git a/language-agent/CLRMetric.proto b/language-agent/CLRMetric.proto
index 6cf5549..32220f7 100644
--- a/language-agent/CLRMetric.proto
+++ b/language-agent/CLRMetric.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.language.agent.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/language/agent/v3";
 
 import "common/Common.proto";
 
diff --git a/language-agent/JVMMetric.proto b/language-agent/JVMMetric.proto
index a7e86a3..77f6d1a 100644
--- a/language-agent/JVMMetric.proto
+++ b/language-agent/JVMMetric.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.language.agent.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/language/agent/v3";
 
 import "common/Common.proto";
 
diff --git a/language-agent/Tracing.proto b/language-agent/Tracing.proto
index e64cb34..e5dde75 100644
--- a/language-agent/Tracing.proto
+++ b/language-agent/Tracing.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.language.agent.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/language/agent/v3";
 
 import "common/Common.proto";
 
diff --git a/management/Management.proto b/management/Management.proto
index d22de66..3604e78 100644
--- a/management/Management.proto
+++ b/management/Management.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.management.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/management/v3";
 
 import "common/Common.proto";
 
diff --git a/profile/Profile.proto b/profile/Profile.proto
index 4a03fb9..678aef3 100644
--- a/profile/Profile.proto
+++ b/profile/Profile.proto
@@ -21,6 +21,7 @@
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.language.profile.v3";
 option csharp_namespace = "SkyWalking.NetworkProtocol";
+option go_package = "skywalking/network/language/profile/v3";
 
 import "common/Common.proto";
 
diff --git a/service-mesh-probe/service-mesh.proto b/service-mesh-probe/service-mesh.proto
index d1d52af..5ce7dc5 100644
--- a/service-mesh-probe/service-mesh.proto
+++ b/service-mesh-probe/service-mesh.proto
@@ -20,6 +20,7 @@
 
 option java_multiple_files = true;
 option java_package = "org.apache.skywalking.apm.network.servicemesh.v3";
+option go_package = "skywalking/network/servicemesh/v3";
 
 import "common/Common.proto";