[DO-971] ffmpeg recipe with requirements (!9)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/9

recipes/libsndfile/all/test_package/test_package.c

@@ -0,0 +1,14 @@
+#include "sndfile.h"
+
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+	if (argc < 2) {
+		puts("Usage: example <file.wav>\n");
+		return 0;
+	}
+	SF_INFO sfinfo;
+    SNDFILE *infile = sf_open (argv[1], SFM_READ, &sfinfo);
+    printf("Sample rate: %d\n", sfinfo.samplerate);
+	return 0;
+}