Add example helloworld and configuration

.drone.yml

@@ -0,0 +1,8 @@
+pipeline:
+    build:
+        image: gcc
+        commands:
+            - make clean
+            - make
+            - make install
+

.gitignore

@@ -31,4 +31,4 @@
 *.exe
 *.out
 *.app
-
+bin/

Makefile

@@ -0,0 +1,14 @@
+.PHONY: all
+all: helloworld
+
+helloworld: helloworld.cpp
+	g++ helloworld.cpp -o helloworld
+
+.PHONY: install
+install:
+	mkdir -p bin
+	mv helloworld bin
+
+.PHONY: clean
+clean:
+	rm -f hello

helloworld.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+using namespace std;
+
+int main()
+{
+    cout << "Hello, World!";
+    return 0;
+}