📝 Add installation docs.

Author: rafalkrupinski

.config/mkdocs.yml

@@ -6,6 +6,7 @@ docs_dir: ../docs
 nav:
 - index.md
 - Usage:
+ - usage/installation.md
  - usage/client.md
  - usage/operation.md
  - usage/auth.md

docs/usage/installation.md

@@ -0,0 +1,26 @@
+# Installation
+
+Lapidary is a library, you can add it to your existing project, but I recommend creating a separate project for each remote service.
+
+## Using poetry
+
+With `poetry` you can install `lapidary` simply by typing:
+```shell
+poetry add lapidary
+```
+
+## Using lapidary-render
+
+If you have OpenAPI 3.0 document, you can initialize a project with lapidary-render:
+
+```shell
+lapidary-render init
+```
+
+or via pipx:
+
+```shell
+pipx run lapidary-render init
+```
+
+See [the documentation](/lapidary-render/) for more details.