feat: added nix shell

shell.nix

@@ -0,0 +1,23 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {    
+    nativeBuildInputs = with pkgs.buildPackages; [
+      # Build tools
+      cmake
+      cmake-format
+      bash
+      curl
+      git
+
+      # Test
+      valgrind
+      gdb
+
+      # Compiler
+      gcc
+
+      # Libraries
+      openssl
+      libsForQt5.full
+      protobuf
+    ];
+  }