Add 'nix flake' manpages

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+R""(
+
+# Examples
+
+* Create a flake using the default template:
+
+  ```console
+  # nix flake init
+  ```
+
+* List available templates:
+
+  ```console
+  # nix flake show templates
+  ```
+
+* Create a flake from a specific template:
+
+  ```console
+  # nix flake init -t templates#simpleContainer
+  ```
+
+# Description
+
+This command creates a flake in the current directory by copying the
+files of a template. It will not overwrite existing files. The default
+template is `templates#defaultTemplate`, but this can be overriden
+using `-t`.
+
+# Template definitions
+
+A flake can declare templates through its `templates` and
+`defaultTemplate` output attributes. A template has two attributes:
+
+* `description`: A one-line description of the template, in CommonMark
+  syntax.
+
+* `path`: The path of the directory to be copied.
+
+Here is an example:
+
+```
+outputs = { self }: {
+
+  templates.rust = {
+    path = ./rust;
+    description = "A simple Rust/Cargo project";
+  };
+
+  templates.defaultTemplate = self.templates.rust;
+}
+```
+
+)""