Update README.md

README.md

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 # CSManager
 * *CSManager* is a management software of crystal databaase.
-  * Runs on Windows OS with .Net Desktop Runtime 7.0 (not .Net Runtime 7.0), which can be installed from [here](https://dotnet.microsoft.com/download/dotnet/7.0).
+  * Runs on Windows OS with .Net Desktop Runtime 9.0 (not .Net Runtime 9.0), which can be installed from [here](https://dotnet.microsoft.com/download/dotnet/9.0).
 
 ## Install
 * Access https://github.com/seto77/CSManager/releases/latest, download *CSManagerSetup.msi*, and execute it.
 
 ## Main features
-* Avalable database
+* Available database
   * AMCSD (American Mineralogist Crystal Structure Database, http://rruff.geo.arizona.edu/AMS/), which contains ~20,000 crystal structures, is initially bundled.
   * COD (Crystallography Open Database, http://www.crystallography.net/cod/), which contains ~450,000 structures, is also available by a separate download.