Created Installation (markdown)

Installation.md

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+### Note
+> The program has both a CLI and a GUI
+## Installing the CLI
+#### Note
+> The cli is cross-platform and in order to use it, you will need to have Python installed on your system
+### Install rom [PyPI](https://pypi.org/project/reddit-post-scraping-tool)
+```
+pip install reddit-post-scraping-tool
+```
+
+### Install the dev version from [GitHub](https://github.com/rly0nheart/reddit-post-scraping-tool)
+#### Note
+> The dev version might be unstable
+```
+pip install git+https://github.com/rly0nheart/reddit-post-scraping-tool
+```
+
+### Usage
+
+```
+reddit_post_scraping_tool --keyword [keyword] --subreddit [subreddit name (without 'r/')]
+```
+
+### Optional arguments
+| Option       | Argument    | Choices    | Usage     |
+| -------------|:-----------:|-----------:|:---------:|
+| -l/--listing | LISTING     | [controversial, hot, best, new, rising]  |  listing: controversial, hot, best, new, rising (default: top)  |
+| -c/--limit   | NUMBER      | 1-100      |  results limit (default: 10)|
+| -t/--timeframe| TIMEFRAME  | [hour, day, week, month, year]           |  timeframe: hour, day, week, month, year (default: all) |
+
+## Setting up the GUI
+#### Note
+> The GUI is only available for Windows systems
+
+### Prerequisites
+* **.NET 6.0 or later**
+
+### 1. Download the GUI from the releases page
+
+You can download the latest release of the gui from [here](https://github.com/bellingcat/octosuite/releases/latest)
+
+
+### 2. Extract the downloaded `.zip`
+![Screenshot_20230210_181651](https://user-images.githubusercontent.com/74001397/218141653-991a91cd-93d5-4640-b2f2-37d29e6a9c62.png)
+
+### 3. Run the binary
+
+Once extracted, you can then run the program by double clicking on a binary named `RPST.exe`
+![Screenshot_20230210_181933](https://user-images.githubusercontent.com/74001397/218142422-70f19a0a-db39-42ee-8ad4-22fe380e249b.png)
+
+![Screenshot_20230210_182210](https://user-images.githubusercontent.com/74001397/218142782-0a9ca4fb-7609-4855-a96b-c58885161166.png)
+