Create Build.md

Build.md

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+# Build Instructions
+
+This document provides instructions on how to build the `ion-sdk-js` project from source.
+
+## Prerequisites
+
+Before you begin, ensure you have the following installed:
+- [Node.js](httpss://nodejs.org/) (which includes npm)
+- [Yarn](httpss://yarnpkg.com/) (optional, but recommended)
+
+## Steps
+
+1. **Clone the repository:**
+   ```sh
+   git clone https://github.com/pion/ion-sdk-js.git
+   cd ion-sdk-js
+   ```
+
+2. **Install dependencies:**
+
+   You can use either npm or yarn to install the project dependencies.
+
+   Using npm:
+   ```sh
+   npm install
+   ```
+
+   Using yarn:
+   ```sh
+   yarn install
+   ```
+
+3. **Build the project:**
+
+   The project can be built by running the following command, which will compile the TypeScript code and then bundle it using webpack.
+
+   Using npm:
+   ```sh
+   npm run prepare
+   ```
+
+   Using yarn:
+   ```sh
+   yarn prepare
+   ```
+
+   This will generate the compiled and bundled files in the `lib` and `dist` directories, respectively.