misc: added flake template (#219)

* Added simple flake template

* Added readme to template

* Updated readme to show how to use the template

* Formatting

* removed unused file from template

* Fixed template url and pkgs

* Formatting

templates/simple/README.md

@@ -0,0 +1,16 @@
+# Nixvim template
+
+This template gives you a good starting point for configuring nixvim standalone.
+
+## Configuring
+
+To start configuring, just add or modify the nix files in `./config`. If you add a new configuration file, remember to add it to the [`congig/default.nix`](./config/default.nix) file
+
+## Testing your new configuration
+
+To test your configuration simply run the following command
+
+```
+nix run .
+```
+

templates/simple/config/bufferline.nix

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+{
+  plugins.bufferline = {
+    enable = true;
+  };
+}

templates/simple/config/default.nix

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+{
+  # Import all your configuration modules here
+  imports = [
+    ./bufferline.nix
+  ];
+}

templates/simple/flake.nix

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+{
+  description = "A nixvim configuration";
+
+  inputs = {
+    nixvim.url = "github:pta2002/nixvim";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    nixpkgs,
+    nixvim,
+    flake-utils,
+    ...
+  } @ inputs: let
+    nixvimLib = nixvim.lib;
+    config = import ./config; # import the module directly
+  in
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
+      nixvim' = nixvim.legacyPackages.${system};
+      nvim = nixvim'.makeNixvimWithModule {
+        inherit pkgs;
+        module = config;
+      };
+    in {
+      checks = {
+        # Run `nix check .` to verify that your config is not broken
+        default = nixvim.lib.${system}.check.checkNvim {
+          inherit nvim;
+          name = "A nixvim configuration";
+        };
+      };
+
+      packages = {
+        # Lets you run `nix run .` to start nixvim
+        default = nvim;
+      };
+    });
+}