add proto file

client/app/src/main/java/com/birdthedeveloper/prometheus/android/prometheus/android/exporter/worker/RemoteWrite.kt

@@ -5,6 +5,7 @@ data class RemoteWriteConfiguration(
     val remote_write_endpoint : String,
 )
 
-class RemoteWrite {
+class RemoteWrite(config : RemoteWriteConfiguration) {
+
     //TODO implement this thing
 }

remote-write.proto

@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+message WriteRequest {
+    repeated TimeSeries timeseries = 1;
+    // Cortex uses this field to determine the source of the write request.
+    // We reserve it to avoid any compatibility issues.
+    reserved  2;
+  
+    // Prometheus uses this field to send metadata, but this is 
+    // omitted from v1 of the spec as it is experimental.
+    reserved  3;
+}
+
+message TimeSeries {
+    repeated Label labels   = 1;
+    repeated Sample samples = 2;
+}
+
+message Label {
+    string name  = 1;
+    string value = 2;
+}
+
+message Sample {
+    double value    = 1;
+    int64 timestamp = 2;
+}