add nghttp3 package definition

pkgs/nghttp3/default.nix

@@ -0,0 +1,33 @@
+{ autoreconfHook
+, lib
+, stdenv
+, fetchFromGitHub
+, pkgconfig
+}:
+
+stdenv.mkDerivation rec {
+  pname = "nghttp3";
+  version = "20210817";
+
+  src = fetchFromGitHub {
+    owner = "ngtcp2";
+    repo = "nghttp3";
+    rev = "149319e6789dcfbe95af3c65c8a132255ef63192";
+    sha256 = "18cbg39vx1aqxmk6lndw5lfkidlsr1n2vba18gdf7wn7a2rw78qv";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [
+    autoreconfHook
+    pkgconfig
+  ];
+
+  meta = with lib; {
+    description = "HTTP/3 library written in C";
+    homepage = https://github.com/ngtcp2/nghttp3;
+    license = licenses.mit;
+    maintainers = with maintainers; [ royneary ];
+    platforms = platforms.linux;
+  };
+}