Create DEVELOPMENT.md file (#1318)

* Create DEVELOPMENT.md

Added the getting started and Ersilia Artifacts session

* Update DEVELOPMENT.md

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Co-authored-by: Dhanshree Arora <[email protected]>

DEVELOPMENT.md

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+# Development
+This file highlight the installation process of getting started with Ersilia, Ersilia Artifacts and Creating a Pull Request.
+
+## Getting Started
+Ersilia can be run either on local computer or with the use of GitHub codespaces. Ersilia is designed to run on **Linux or Linux-like environments** namely: MacOS, Windows Sub-system for Linux (WSL) and at present is not supported on Windows systems.
+
+- ### Installation of Ersilia on local computer
+To get started with Ersilia installation, there are few dependencies that needs to be installed before proceeding to installation of Ersilia. Please, check the package requirement in the [Installation Guide](https://ersilia.gitbook.io/ersilia-book/ersilia-model-hub/installation)
+1. Once the required dependencies has been installed, open a terminal and set up a Conda environment.
+
+```
+# create a conda environment
+conda create -n ersilia python=3.10
+# activate the environment
+conda activate ersilia
+```
+2. Clone the repository and run to install the Ersilia Python package.
+```
+# clone from github
+git clone https://github.com/ersilia-os/ersilia.git
+cd ersilia
+# install with pip (use -e for developer mode)
+pip install -e .[test]
+```
+**The -e (editable) for developer mode ensures that whenever a user change the code, they don't need to reinstall ersilia for those changes to take effect.**
+
+3. To test that the CLI works, explore this command
+```
+# output to see command options for ersilia
+ersilia --help
+```
+4. Once ersilia is recognized in the CLI, test any model of your choice.
+- First, you can check the list of available model in ersilia's catalog
+```
+#see ersilia's model catalog
+ersilia catalog
+```
+- Next, you can run the model
+```
+ersilia -v fetch eos2ta5 #fetch a model
+ersilia serve eos2ta5 #serve a model
+ersilia -v api run -i "CCCC" #run a model
+```
+
+Note: The usage -v (verbose) flag is of utmost importance for developers as it provides detailed logs which helps to debug and troubleshoot issues.
+
+- ### Using GitHub Codespaces
+If difficulties are encountered while setting up Ersilia locally, another cloud-based development environment which suppoort linux is a great alternative.
+GitHub codespaces allows you to run and develop Ersilia directly from your browser.
+
+To use Github Codespaces:
+
+ **1. Fork and Clone the Repository**
+
+ - Navigate [Ersilia repository](https://github.com/ersilia-os/ersilia) on GitHub.
+ - Click on the **Fork** button in the top right corner to create a fork.
+ - Go to the forked repository, Click on the <> **Code**.
+ - Click **Create codespace**.
+
+A pop up page "Setting up your codespace" is displayed on the screen. After a while, the codespace is created in a browser-based version using the built-in Visual studio code interface 
+
+**2. Setting Up GitHub Codespaces Environment**
+
+- Once you open the codespaces environment, ersilia has been installed and ready for usage. To double check, you can verify by running this command `ersilia --version`. This
+will display the version of ersilia installed.
+
+**3. Run Ersilia Model**
+- Directly from the code space terminal, you can fetch, serve and run Ersilia model.
+To run a model with verbose output:
+`ersilia -v run eos2ta5`
+
+## Ersilia Artifacts
+After successful installation of ersilia in the user's local computer, the system creates an EOS directory in the user's `$HOME` path. This directory stores ersilia artifacts that the local computer uses when doing any operation (model execution) in Ersilia.
+Folders found in the `$HOME` directory includes:
+
+**Folders**
+- dest/: stores output generated when running a model.
+- isaura/: cache model prediction which stores them in the local computer
+- repository/: main directory to cache models files and datasets. This prevent redundant download by storing previously fetched model
+- sessions/: Tracks user session
+- tmp/: stores temporary file during model execution.
+
+## Creating a Pull Request
+To get started, please read and follow our [Code of Conduct](https://github.com/ersilia-os/ersilia/blob/master/CODE_OF_CONDUCT.md).
+
+Before submitting a pull request, please ensure your code has been tested. After making any changes, **run the test suites** to test the code properly. 
+
+To do this, use this command to run the test with -v (verbose) output: `pytest -v`
+
+**1. Via GitHub Codespaces Environment**
+- In the codespace terminal, create a new branch
+```
+git checkout -b your-branch-name
+```
+- Make all necessary changes and commit them
+```
+git add .
+git commit -m "Description of changes made"
+```
+- Push changes to GitHub
+```
+git push origin your-branch-name
+```
+- Click on **Create pull request** in the prompt that will be shown
+
+**2. Via GitHub Desktop**
+- Fork the repository
+- Create a new branch and name it.
+- Commit your changes
+- Navigate the repository,Click on **Compare & pull request** 
+- Set the main branch to **master** (name of ersilia repository main branch) and set the compare branch to your-branch-name
+- Fill out the title section and give a brief description of any changes made
+- Click **Create Pull Request**
+
+
+
+
+