Add sb_read_file()

example/sb.c

@@ -0,0 +1,17 @@
+#define GEBS_NO_PREFIX
+#define GEBS_IMPLEMENTATION
+#include "../gebs.h"
+
+int main(int argc, char ** argv)
+{
+    String_Builder sb_c;
+    if (!sb_read_file(&sb_c, "sb.c")) {
+        LOGE("Could not read sb.c. sb.c is in example/\n");
+        return 1;
+    }
+    sb_finish(&sb_c);
+
+    printf("%s\n", sb_c.items);
+
+    return 0;
+}