Create Xcode12Issues.md

Xcode12Issues.md

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+# Xcode 12 Clang: Error in PodSpec Validation due to architectures
+
+## To resolve above issue do the following:
+
+Choose the right section to resolve it on your side.
+
+> For SDK owners:
+
+The solution is to open the podspec and add below:
+
+```ruby
+s.pod_target_xcconfig = { 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64'}
+s.user_target_xcconfig = { 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64'}
+s.ios.deployment_target  = '10.0' // not required
+```
+
+> For SDK users:
+
+1. Navigate to Build Settings of your project and add Any iOS Simulator SDK with value arm64 inside Excluded Architecture.
+
+![image](https://user-images.githubusercontent.com/3921852/95323083-3dd69b00-08a6-11eb-9648-b69f47b10494.png)
+
+2. On Podfile add:
+
+```ruby
+post_install do |installer|
+  installer.pods_project.build_configurations.each do |config|
+    config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] = "arm64"
+  end
+end
+```
+