update: README instructions

Author: wackerow

README.md

@@ -70,16 +70,52 @@ git fetch upstream
 git merge upstream/dev
 ```
 
-2. Install dependencies
+2. Prepare package manager
 
 We've upgraded to pnpm to speed up development experience and improve dependency management.
 
 We recommend using a [node manager such as nvm](https://github.com/nvm-sh/nvm?tab=readme-ov-file#intro) to use multiple node versions in your system. We have a `.nvmrc` file that declares the canonical Node.js version for this project. If you use `nvm`, you can run `nvm use` to automatically switch to the correct version.
 
+**Use current node version (recommended)**
+
+```sh
+nvm use
+```
+
+Corepack is a tool that allows you to use package managers like pnpm, yarn, and npm without needing to install them globally. It ensures that the correct version of the package manager is used for your project.
+
+**Enable corepack (recommended):**
+
+```sh
+corepack enable
+```
+
+3. Install dependencies
+
 ```sh
 pnpm install
 ```
 
+#### Migrating from yarn to pnpm
+
+If you previously used `yarn` to install dependencies, you can safely migrate to `pnpm` by running the following commands:
+
+```sh
+# Remove yarn.lock file
+rm yarn.lock
+
+# Remove node_modules directory
+rm -rf node_modules
+
+# Clean yarn cache (optional)
+yarn cache clean
+
+# Install dependencies with pnpm
+pnpm install
+```
+
+This will cleanly switch the project working directory from yarn to pnpm without leaving any residual yarn configuration.
+
 ### 4. Make awesome changes!
 
 1. Create new branch for your changes