Add general documentation and docs for alias-toolkit

Docs/alias-toolkit.md

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+# Alias Toolkit
+ ## How to use Alias Toolkit
+ 1. Download the script or clone this repository
+ 2. Make sure the execution policy is set properly (Or run Set-ExecutionPolicy Bypass -Scope Process)
+ 3. Run the script.
+ 4. Follow the on-screen prompts.
+ 
+> _If target is Exchange Server, run script from the Exchange Management Shell._
+> 
+>_If target is Exchange Online, run from a PS session that has already connected to Exchange Online Management Shell._
+
+ ## Alias Toolkit Options
+ ### 1. List contents of a .csv
+ Use this option to verify that your .csv file containing email addresses is formatted correctly. The output should look like:
+
+> _Display Name_
+> 
+> _Email Address 1_
+> 
+> _Email Address 2_
+> 
+> _Email Address 3_
+
+ If the email addresses are on a single line, your formatting isn't correct and the import will import all your addresses as a single email address.
+
+ ### 2. Apply the contents of a .csv to the currently logged in Exchange session
+ Use this option to apply the email addresses when you've verified that the .csv is formatted correctly.
+
+> ***This will apply the email addresses based on Display Name, so make sure that if display names were changed between environments, the .csv has been edited to reflect the changes.***
+
+ ### 3. Create a .csv based on a search term
+ This option will create a .csv with the columns Displayname and EmailAddresses based on the search term given.  
+ This uses `Get-Mailbox | Where-Object $_.EmailAddresses -like "$SearchTerm"`, so it will support wildcards.
+
+ >***This won't give you a .csv you can apply by default, this is by design. `You need to replace the spaces with ; in the EmailAddresses column.` This was implemented to ensure double-checking no unwanted addresses are included into the import.***
+
+ ### 4. Use the legacy search script and output the alias list to console.
+ This does the same as the above option, but outputs the results to console with some nice-ish formatting. This is an adaptation of search-email-addresses. 

README.md

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 # Exchange-Scripts
 
-Various scripts used for management tasks (and migrations) on Exchange server
+This repo contains various scripts used for management tasks (and migrations) on Exchange Server (and Exchange Online). You can click on the script name to see documentation for it.
+
+# Scripts
+- [**Alias Toolkit**](Docs/alias-toolkit.md) - Easy to use, menu-based script for searching for, exporting and importing aliases from/to Exchange (Online).
+- **List alias .csv contents** - _This has been integrated into Alias Toolkit._
+- **Search Email Addresses** - _This has been integrated into Alias Toolkit._