Documentation for user installation of the Pelican Client

First draft of user installation guide. Accepting any and all feedback since I am not too experienced in documentation.

docs/install.md

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+Installing the Pelican Platform
+===============================
+
+This document explains how a user can download and install the Pelican client. 
+
+Installation Steps:
+--------------------
+
+### Install the Pelican Platform Binary
+Navigate to the [Pelican release page](https://github.com/PelicanPlatform/pelican/releases/). Download the proper binary for the system you are running on and select which version you would like to install. 
+
+Our versions are built like so:
+For example: 7.1.2
+- 7 represents the latest major version release
+- 1 represents feature releases
+- 2 represents a bug fix/patch release
+
+### Extract the Binary
+Once the package has finished downloading, place it in your workspace and extract the binary
+
+### Test Functionality of the Pelican Platform
+Once extracted, make sure you are in the same directory as the **Pelican** executable. To test if everything works, we can do a simple **object copy** command:
+
+```console
+./pelican -f osg-htc.org object copy /osgconnect/public/osg/testfile.txt .
+testfile.txt 36.00 b / 36.00 b [=============================================================================================] Done!
+```
+
+You should now notice a file **testfile.txt** now in your directory.
+
+Congrats on making your first Pelican Object Copy!