add installation guide

README.md

@@ -5,10 +5,30 @@ The primary goal of the project was to help detect the presence of Greek charact
 We begin this project with a few simple functions:
 1. FindFirstLatin - The first match of a group of Latin characters (words) found within the selected (assumed Greek) text.
 2. FindFirstGreek - The first match of a group of Greek characters (words) found within the selected (assumed Latin) text.
-3. FindFirstRegex - The first match of the supplied .NET compatible Regular Expression pattern within the slected text.
+3. FindFirstRegex - The first match of the supplied .NET compatible Regular Expression pattern within the selected text.
 4. FindAllLatin - Returns a comma separated list of Latin characters (words) within the selected text.
 5. FindAllGreek - Returns a comma separated list of Greek characters (words) within the selected text.
-6. FindAllRegex - Returns a comma separated list of all matches of the supplied .NET compatible Regular Expression pattern within the slected text.
+6. FindAllRegex - Returns a comma separated list of all matches of the supplied .NET compatible Regular Expression pattern within the selected text.
 
+## Installation
+1. Download the correct version for your version of Excel from the <a href="Excel.Cell.Checker-AddIn64-packed.xll" target="_blank">releases</a> page:
+    * Excel 32-bit: Excel.Cell.Checker-AddIn-packed.xll
+    * Excel 64-bit: Excel.Cell.Checker-AddIn64-packed.xll
+
+2. In Excel, go to File > Options and follow the steps below to install the AddIn.
+
+    Click on "Add-ins" and make sure "Excel Add-ins" is selected in the "Manage" list and click Go. 
+![Manage Excel Addins. Go to File > Options](images/manage-addins.png)
+
+    In the box that appears, click Browse
+![Click Browse to find the xll file you downloaded in Step 1](images/browse.png)
+
+    Locate the file you downloaded in Step and and click OK.
+![Select the downloaded xll file](images/select.png)
+
+    That's It! You can now use the functions in Excel
+
+![Usage in Excel](images/demo.png) 
+
 ## Note on Regular Expressions
 The FindFirstRegex and FindAllRegex functions are meant to be used with <a href="https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expressions" target="_blank">.NET compatible regular expressions</a> including Exclusion groups! Special features of other Regex parsers will not work and might generate errors.