added raw library encryption test with static keys, cipher and message

tests/statictest.c

@@ -0,0 +1,20 @@
+#include <pcp.h>
+#include "static.h"
+
+int main() {
+  unsigned char *t = ucmalloc(12);
+  if(pcp_sodium_verify_box(&t, cipher, cipher_len, nonce, secret_b, public_a) == 0) {
+    if(memcmp(t, message, message_len) == 0) {
+      printf("ok\n");
+    }
+    else {
+      printf("decrypted but message doesnt match\n");
+      return 1;
+    }
+  }
+  else {
+    printf("failed to decrypt\n");
+    return 1;
+  }
+  return 0;
+}