pl-fe: update building page

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

docs/building.md

@@ -1 +1,27 @@
-# Building pl-fe
+# Building pl-fe
+
+Building pl-fe requires [Node.js](https://nodejs.org/) and [pnpm](https://pnpm.io/) package manager to be installed. Since Node v16.13, Node.js comes with `corepack` pre-installed, which can be used to manage package managers like `pnpm`.
+
+To enable `pnpm` using `corepack`, run the following command:
+
+```bash
+corepack enable pnpm
+```
+
+You can now proceed to fetching pl-fe Git repository, installing dependencies, and building the project:
+
+```bash
+# Clone the pl-fe repository
+git clone https://codeberg.org/mkljczk/pl-fe.git
+cd pl-fe
+# Install dependencies
+pnpm install
+# Build the pl-api dependency
+cd packages/pl-api
+pnpm build
+cd ../pl-fe
+# Build the pl-fe project
+pnpm build
+```
+
+The built files will be located in the `packages/pl-fe/dist` directory. You can [serve them using a static web server](./installing/standalone.md).