feat(c): Add Hello World program in C

- Create new file hello_c.c with basic Hello World implementation
- Include shebang for easy compilation and execution

c/hello_c.c

@@ -0,0 +1,11 @@
+// 2>/dev/null; set -e; X=${0%.c} ; [ "$X" -nt "$0" ] || cc -o "$X" -I$HOME/kisskit "$0" && hide "$X"; exec "$X" "$@"
+// hello.c:
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	printf("Hello, world\n");
+	exit(0);
+}