Add 'nix flake' manpages

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+R""(
+
+# Examples
+
+* Evaluate the flake in the current directory, and build its checks:
+
+  ```console
+  # nix flake check
+  ```
+
+* Verify that the `patchelf` flake evaluates, but don't build its
+  checks:
+
+  ```console
+  # nix flake check --no-build github:NixOS/patchelf
+  ```
+
+# Description
+
+This command verifies that the flake specified by flake reference
+*flake-url* can be evaluated successfully (as detailed below), and
+that the derivations specified by the flake's `checks` output can be
+built successfully.
+
+# Evaluation checks
+
+This following flake output attributes must be derivations:
+
+* `checks.`*system*`.`*name*
+* `defaultPackage.`*system*`
+* `devShell.`*system*`
+* `nixosConfigurations.`*name*`.config.system.build.toplevel
+* `packages.`*system*`.`*name*
+
+The following flake output attributes must be [app
+definitions](./nix3-run.md):
+
+* `apps.`*system*`.`*name*
+* `defaultApp.`*system*`
+
+The following flake output attributes must be [template
+definitions](./nix3-flake-init.md):
+
+* `defaultTemplate`
+* `templates`.`*name*
+
+The following flake output attributes must be *Nixpkgs overlays*:
+
+* `overlay`
+* `overlays`.`*name*
+
+The following flake output attributes must be *NixOS modules*:
+
+* `nixosModule`
+* `nixosModules`.`*name*
+
+The following flake output attributes must be
+[bundlers](./nix3-bundle.md):
+
+* `bundlers`.`*name*
+* `defaultBundler`
+
+In addition, the `hydraJobs` output is evaluated in the same way as
+Hydra's `hydra-eval-jobs` (i.e. as a arbitrarily deeply nested
+attribute set of derivations). Similarly, the
+`legacyPackages`.*system* output is evaluated like `nix-env -qa`.
+
+)""