Create README.md

Author: MaximeCheramy

README.md

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+# cmake-gcc-runner
+
+This is a C/C++ runner for CMake projects (based on GCC).
+
+## How to Use it
+
+```yaml
+runner:
+  name: codingame/cmake-gcc-runner
+  version: 1.0-gcc-6.3
+```
+
+Your project will be compiled one with:
+
+```
+cmake .
+make
+```
+
+And on each run, `make` will be executed and the command specified in the markdown file will be executed.
+
+## Example
+
+In this example, the unit testing framework "Catch" is used. Here's the content of the CMakeLists.txt file:
+
+```
+cmake_minimum_required(VERSION 2.8.9)
+project (tests)
+add_executable(tests tests.cpp factorial.cpp factorial.h)
+
+# Includes Catch in the project:
+add_subdirectory(catch)
+include_directories(${CATCH_INCLUDE_DIR} ${COMMON_INCLUDES})
+enable_testing(true)  # Enables unit-testing.
+
+add_dependencies(tests catch)
+
+add_test(factorial ./tests [factorial])
+```
+
+Here's the stub (factorial.cpp):
+
+```C++
+unsigned int Factorial( unsigned int number ) {
+    return number <= 1 ? number : Factorial(number-1)*number;
+}
+```
+
+And the main file (tests.cpp):
+
+```C++
+#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
+#include "catch.hpp"
+#include "factorial.h"
+
+TEST_CASE( "Factorials are computed", "[factorial]" ) {
+    REQUIRE( Factorial(1) == 1 );
+    REQUIRE( Factorial(2) == 2 );
+    REQUIRE( Factorial(3) == 6 );
+    REQUIRE( Factorial(10) == 3628800 );
+}
+```
+
+In the markdown file, you must specify the command used to execute your test.
+
+```markdown
+@[Example]({"stubs": ["factorial.cpp"], "command": "./tests [factorial]"})
+```