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BUILD.md

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+# Building Yail
+
+This document provides instructions on how to build the Yail library from the source.
+
+## Prerequisites
+
+Before you begin, ensure you have met the following requirements:
+
+- [Node.js](https://nodejs.org/en/): Use [nvm](https://github.com/nvm-sh/nvm) to
+  switch to the version specified in the [.nvmrc](./.nvmrc) file. To ensure
+  you're using the correct version of Node.js for this project, run `nvm use` in
+  the project directory.
+- [pnpm](https://pnpm.io/): Install pnpm globally with `npm install -g pnpm`.
+
+## Setting Up the Development Environment
+
+### Clone the Repository
+
+First, clone the repository to your local machine:
+
+```bash
+git clone https://github.com/Programmer-Network/yail.git
+cd yail
+```
+
+### Install Dependencies
+
+Use `pnpm` to install all necessary dependencies:
+
+```bash
+pnpm install
+```
+
+## Building for Production
+
+To build the library for production, run the following command:
+
+```bash
+pnpm build
+```
+
+This will create a `dist` folder with the compiled code.
+
+## Running Tests
+
+To run the test suite, use the following command:
+
+```bash
+pnpm test