add nix shell

.vscode/settings.json

@@ -2,5 +2,7 @@
     "rust-analyzer.linkedProjects": [
         "taptrade-cli-demo/coordinator/Cargo.toml",
         "taptrade-cli-demo/trader/Cargo.toml",
-    ]
+    ],
+    "nixEnvSelector.suggestion": true,
+    "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix"
 }

shell.nix

@@ -0,0 +1,15 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    nativeBuildInputs = with pkgs.buildPackages; [ 
+        pkg-config 
+        zlib 
+        openssl 
+        cargo 
+        rustc 
+        rustfmt
+        gcc
+     ];
+     RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+}
+
+# For VSCode and Rust Analyzer use the Extension "Nix Environment Selector"

taptrade-cli-demo/coordinator/src/communication/mod.rs

@@ -4,7 +4,7 @@
 fn index() -> &'static str {
     "Hello, world!"
 }
-
+j
 #[launch]
 pub fn webserver() -> Rocket<build> {
     rocket::build().mount("/", routes![index])