Document locations of default logo files

Author: Musa Demir

docs/en/Customization-Angular.md

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+## Customization
+
+##### Changing Logos
+
+Our default template has 5 logo and they are located in `aspnet-zero-core\angular\src\assets\common\images`
+
+1. app-logo-on-dark.svg
+2. app-logo-on-dark-sm.svg
+3. app-logo-on-light.svg
+4. app-logo-on-light-sm.svg
+5. logo.svg (used in `InvoiceController -> Index`)
+
+`*-dark-*`versions are used for light colored themes.
+
+`*-light-*` versions are used for dark colored themes.
+
+In some themes the footer may also have an icon.  `-sm.svg` versions are included in the footer of these themes.

docs/en/Customization-Core-Mvc.md

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+## Customization
+
+##### Changing Logos
+
+Our default template has 5 logo and they are located in `/aspnet-core\src\MyCompanyName.AbpZeroTemplate.Web.Mvc\wwwroot\Common\Images`
+
+1. app-logo-on-dark.svg
+2. app-logo-on-dark-sm.svg
+3. app-logo-on-light.svg
+4. app-logo-on-light-sm.svg
+5. logo.svg (used in `InvoiceController -> Index`)
+
+`*-dark-*`versions are used for light colored themes.
+
+`*-light-*` versions are used for dark colored themes.
+
+In some themes the footer may also have an icon.  `-sm.svg` versions are included in the footer of these themes.