Add forking & development readme (#133)

* Add forking readme

* Add development guidlenies

* Apply grammarly

* Update README.md

* Create forking.md

* Update README.md

---------

Co-authored-by: Adrian Pilarczyk <admin@peelar.dev>

README.md

@@ -11,17 +11,19 @@
 <div align="center">
   <a href="https://saleor.io/">🏠 Website</a>
   <span> • </span>
-  <a href="https://docs.saleor.io/docs/3.x/developer/extending/apps/key-concepts">📚 Docs</a>
+  <a href="https://docs.saleor.io/docs/3.x">📚 Docs</a>
   <span> • </span>
   <a href="https://saleor.io/blog/">📰 Blog</a>
   <span> • </span>
   <a href="https://twitter.com/getsaleor">🐦 Twitter</a>
 </div>
 
-<br />
-
 <div align="center">
-  <a href="https://docs.saleor.io/docs/3.x/developer/extending/apps/quickstart/getting-started">Build an app ▶️</a>
+  <a href="https://docs.saleor.io/docs/3.x/developer/extending/apps/quickstart/getting-started">🆕 Apps Quickstart</a>
+  <span> • </span>
+  <a href="https://github.com/orgs/saleor/projects/22/views/1">🗓️ Roadmap</a>
+  <span> • </span>
+  <a href="https://github.com/saleor/apps/discussions/categories/integrations-features">✍️ Propose an app</a>
 </div>
 
 ## Overview
@@ -32,9 +34,51 @@ This repository serves as a starting point in the exploration of Saleor apps.
 >
 > [docs.saleor.io](https://docs.saleor.io/docs/3.x/developer/extending/apps/key-concepts)
 
-From here, you can visit:
+### Apps list
 
-- [🔍 Apps documentation](https://docs.saleor.io/docs/3.x/developer/extending/apps/key-concepts) - to learn more about how you can use apps to extend the capabilities of Saleor.
-- [🆕 Quickstart Tutorial](https://docs.saleor.io/docs/3.x/developer/extending/apps/quickstart/getting-started) - to build your first app using [Saleor CLI](https://docs.saleor.io/docs/3.x/cli).
-- [🗓️ Roadmap](https://github.com/orgs/saleor/projects/22/views/1) - to see the current progress on the development of official Saleor apps.
-- [✍️ GitHub issues](https://github.com/saleor/apps/discussions/categories/integrations-features) - to submit a proposal for creating a new integration or an app.
+In the `apps` folder, you will find the following applications:
+
+- [data-importer](./apps/data-importer) - import data from CSV to Saleor.
+- [invoices](./apps/invoices) - generate invoice PDF for each order.
+- [klaviyo](./apps/klaviyo) - send Saleor events to Klaviyo, where you can notify the customers.
+- [search](./apps/search) - connect Saleor with search engines.
+- [slack](./apps/slack) - get notifications on Slack channel from Saleor events.
+
+## Development
+
+### Setup
+
+Make sure you have installed `pnpm`:
+```bash
+npm install -g pnpm
+```
+
+Install all dependencies:
+```bash
+pnpm install
+```
+
+Start the apps` dev servers:
+```bash
+pnpm dev
+```
+
+> The apps' ports will be displayed in the terminal output.
+>
+> You can find the required env vars for each app in `apps/NAME/.env.example` file.
+
+To start an individual app, run:
+```bash
+pnpm dev --filter=saleor-app-X
+```
+
+where X is the app's name (matching saleor/X).
+
+### Build
+To build all apps, run:
+```bash
+pnpm build
+```
+
+### Documentation
+- [Forking](/docs/forking.md)

docs/forking.md

@@ -0,0 +1,30 @@
+# Forking
+
+Saleor apps come out of the box in Saleor Cloud plans, but all apps are open source and can be used
+under the [BSD-3 license](../LICENSE).
+
+When forking, you are most likely interested in an individual app. This monorepo, however, contains all of the Saleor apps.
+
+Luckily, you can still fork and be able to track and merge the original source code with two strategies:
+
+## 1. Delete unused apps
+
+The repository contains apps and packages which are imported by apps. Apps never import other apps,
+so you can safely delete them.
+
+When you remove all the apps except the one you need, Turborepo will continue to work the same way.
+
+Additionally, you can run scripts per individual apps with `turbo run SCRIPT --filter=saleor-app-NAME`.
+
+We recommend not removing anything else to avoid unnecessary conflicts.
+
+If you want to update the repository, you can still merge or rebase it with the original source code. 
+You may face conflicts for apps you don't have anymore, but you can safely delete them again during conflict resolution.
+
+## 2. Keep everything
+
+To avoid conflicts to a minimum, you can leave other apps and just ignore them. These tips can help you with a single app experience:
+- Mark other app folders as "excluded" in your IDE to avoid indexing these files.
+- Run your scripts with Turborepo filters, e.g. `turbo run SCRIPT --filter=saleor-app-NAME`.
+- Use `pnpm` to avoid duplicated packages. `pnpm` installs packages once and links them, which causes minimal performance overhead of node_modules.
+