Add instruction on how to build Jekyll website

qosf.org/Build_Instructions.md

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+
+# Build Instructions
+
+This document provides detailed instructions on how to build and run the Jekyll website from this repository.
+
+## Prerequisites
+
+Before you begin, ensure you have the following installed on your system:
+- Ruby (2.7 or higher)
+- RubyGems
+- Bundler
+
+You can check your Ruby and RubyGems installation by running:
+
+```bash
+ruby -v
+gem -v
+```
+
+If you need to install Ruby, please follow the instructions on the [official Ruby website](https://www.ruby-lang.org/en/documentation/installation/).
+
+## Setup
+
+### 1. Clone the Repository
+
+First, clone the repository to your local machine using the following command:
+
+```bash
+git clone https://github.com/qosf/qosf.org.git
+cd qosf.org/qosf.org
+```
+
+### 2. Install Dependencies
+
+Install the necessary Ruby gems (including Jekyll) using Bundler:
+
+```bash
+bundle install
+```
+
+This command reads the `Gemfile` and installs all the required gems.
+
+## Build the Site
+
+To build your static site, run:
+
+```bash
+bundle exec jekyll build
+```
+
+This command generates the static site output in the `_site` directory.
+
+## Serve the Site Locally
+
+To serve your website locally and see it in action, run:
+
+```bash
+bundle exec jekyll serve
+```
+
+This will start a local web server. You can view your website by navigating to `http://localhost:4000` in your web browser. The server will automatically rebuild the site as you make changes to the files.