Added clojure devenv template and more stuff

data/devenv/templates/clojure/flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "Development flake for this clojure project";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system: let
+
+      pkgs = nixpkgs.legacyPackages.${system};
+
+      projectDependencies = with pkgs; [
+      ];
+
+    in {
+      devShells.default = pkgs.mkShell {
+        nativeBuildInputs = [ pkgs.bashInteractive ];
+        buildInputs = with pkgs; [
+          # Core clojure dependencies
+          clojure
+          leiningen
+          # IDE tools
+          clojure-lsp
+          # Development tools
+        ] ++ projectDependencies;
+
+      };
+    });
+}