Create `nix derivation add` command

Also refine `nix derivation show`'s docs very slightly.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/nix/derivation-add.md b/src/nix/derivation-add.md
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+R""(
+
+# Description
+
+This command reads from standard input a JSON representation of a
+[store derivation] to which an [*installable*](./nix.md#installables) evaluates.
+
+Store derivations are used internally by Nix. They are store paths with
+extension `.drv` that represent the build-time dependency graph to which
+a Nix expression evaluates.
+
+[store derivation]: ../../glossary.md#gloss-store-derivation
+
+The JSON format is documented under the [`derivation show`] command.
+
+[`derivation show`]: ./nix3-derivation-show.md
+
+)""