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docs/INTERPRET_FROM_SOURCE.md

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+# Interpret from source code
+## Requirements
+### Python 3 Interpreter
+- This program is designed to work best on **Python 3.6.5** and this version of Python 3 is suggested. See if it is already installed, [here](#finding-the-correct-keyword-for-python).  
+- If not, download the matching release for your platform [here](https://www.python.org/downloads/) and install it. If you are a *Windows* user, selecting **Add Python 3 to PATH** option when installing the software is mandatory.   
+
+## Using terminal
+### To open it...
+-  **on Windows**: Press **Shift+Right Click**, select **Open Powershell window here** or **Open Command Prompt window here**
+  
+- **on Linux**: Right-click in a folder and select **Open Terminal** or press **Ctrl+Alt+T**.
+  
+- **on MacOS**: Look for an app called **Terminal**.
+  
+### Navigating to the directory where script is downloaded
+Go inside the folder where script.py is located. If you are not familiar with changing directories on command-prompt and terminal read *Changing Directories* in [this article](https://lifehacker.com/5633909/who-needs-a-mouse-learn-to-use-the-command-line-for-almost-anything)
+
+## Finding the correct keyword for Python
+Enter these lines to terminal window until it prints out the version you have downloaded and installed:
+  
+- `python --version`
+- `python3 --version`
+- `python3.7 --version`
+- `python3.6 --version`
+- `py --version`
+- `py -3 --version`
+- `py -3.6 --version`
+- `py -3.7 --version`
+  
+Once it does, your keyword is without the `--version` part. 
+
+## Installing dependencies
+Enter the line below to terminal window when you are in the directory where script.py is, use your keyword for Python:
+```console
+python -m pip install -r requirements.txt
+```
+  
+---
+  
+Now, you can go to [Using command-line arguments](COMMAND_LINE_ARGUMENTS.md)