Add quickstart

gebs.h

@@ -25,6 +25,51 @@ OTHER DEALINGS IN THE SOFTWARE.
 For more information, please refer to <https://unlicense.org/>
 */
 
+/* QUICKSTART
+
+// Put into mybuild.c
+// Building: cc -o mybuild mybuild.c
+// Rebuilding: ./mybuild # will auto-recompile
+
+#define GEBS_NO_PREFIX      // strips the GEBS_ and gebs_ prefixes (optional)
+#define GEBS_IMPLEMENTATION // include function definitions, not just declarations
+#include "../gebs.h"        // include gebs
+
+int main(int argc, char ** argv)
+{
+    // A gebs executable can recompile itself. We must supply a compiler commandline
+    // for recompiling. This means we can also put additional flags here.
+    rebuild_self(argc, argv, "cc", "-o", "self_rebuild", __FILE__);
+
+    // create a build directory
+    if (!exists1("build")) {
+        mkdir1("build");
+    }
+
+    // Create a dependecy:
+    //
+    //              build/myapp
+    //                (target)
+    //                   |
+    //                  / \
+    //                 /   \
+    //                /     \
+    //            myapp.c  gebs.h
+    //
+    //  This means that if files myapp.c or gebs.h change, build/myapp will be recompiled.
+    
+    RULE("build/myapp", "myapp.c", "gebs.h") {
+        // commandline for building target build/myapp
+        // We can also check the error code of CMD(), but this is just an example.
+        
+        CMD("cc", "-ggdb", "-o", "build/myapp", "myapp.c");
+    }
+
+    return 0;
+}
+
+*/
+
 #ifndef GEBS_H_
 #define GEBS_H_