Add experimental gRPC-Web folder

grpc/backend/README.md

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+# Backend
+
+This folder contains all the code used to implement the backend server.

grpc/backend/backend.go

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+package backend
+
+import (
+	"context"
+
+	"github.com/johanbrandhorst/wasm-experiments/grpc/proto/server"
+)
+
+// Backend should be used to implement the server interface
+// exposed by the generated server proto.
+type Backend struct {
+}
+
+// Ensure struct implements interface
+var _ server.BackendServer = (*Backend)(nil)
+
+func (b Backend) GetUser(ctx context.Context, req *server.GetUserRequest) (*server.User, error) {
+	return &server.User{
+		Id: "1234",
+	}, nil
+}