make the gRPC client a runnable go program again

Author: Massimiliano Pippi

Diff for: .gitignore

@@ -10,4 +10,9 @@ coverage_*.txt
 __pycache__
 venv
 .pytest_cache
-/dist
+/dist
+
+# gRPC client example folder
+/client_example/client_example
+*.bin
+*.elf

Diff for: client_example/go.mod

@@ -0,0 +1,8 @@
+module github.com/arduino/arduino-cli/client_example
+
+go 1.12
+
+require (
+	github.com/arduino/arduino-cli v0.0.0-20190826141027-35722fda467d
+	google.golang.org/grpc v1.23.0
+)

Diff for: client_example/go.sum

@@ -0,0 +1,124 @@
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Diff for: client_example/hello.ino

@@ -0,0 +1,7 @@
+void setup() {
+  // put your setup code here, to run once:
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+}