Addressing PR issues

Author: WardenGnaw

src/main.ts

@@ -123,7 +123,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<CSharp
 
     if (!isSupportedPlatform(platformInfo)) {
         const platform: string = platformInfo.platform ? platformInfo.platform : "this platform";
-        const architecture: string = platformInfo.architecture ? platformInfo.architecture : " and architecture";
+        const architecture: string = platformInfo.architecture ? platformInfo.architecture : " and <unknown processor architecture>";
         let errorMessage: string = `The C# extension for Visual Studio Code (powered by OmniSharp) is incompatiable on ${platform} ${architecture}`;
         const messageOptions: vscode.MessageOptions = {
         };

src/platform.ts

@@ -191,6 +191,9 @@ export class PlatformInformation {
             if (process.env.PROCESSOR_ARCHITECTURE === 'x86' && process.env.PROCESSOR_ARCHITEW6432 === undefined) {
                 resolve('x86');
             }
+            else if (process.env.PROCESSOR_ARCHITECTURE === 'ARM64' && process.env.PROCESSOR_ARCHITEW6432 === undefined) {
+                resolve('ARM64');
+            }
             else {
                 resolve('x86_64');
             }