update installation notes

Installer/AppleScriptInstall/Readme/README.md

@@ -1,4 +1,16 @@
-# Pareizrakstība Installation
+# Pareizrakstība
+
+Pareizrakstība - Latvian spellcheck for macOS operating system.  
+Service that adds support for system wide spellchecking in Latvian language.
+
+## Requirements
+
+* Built for macOS 10.13+ (it could be built for older deployment targets).  
+* Tested on 10.15.5. and 10.13.6
+* 64-bit only.
+* For yet older OS versions, see [Pareizrakstiba-Archive](https://github.com/WARP-LAB/Pareizrakstiba-Archive).
+
+## Installation
 
 This application is not signed as the developer is not willing to pay the Apple fee[1].