added instructions to get permission to use assets (#4938)

assets/README.md

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+# Use of Trademarked Logos
+
+The assets in this folder are trademarked by Microsoft and don't fall under the same [License](https://raw.githubusercontent.com/PowerShell/PowerShell/master/LICENSE.txt) as the source code.
+
+## Permitted Uses
+
+Parties interested in using these logos can review the [Use of Microsoft Copyrighted Material](https://www.microsoft.com/en-us/legal/intellectualproperty/permissions) page.
+If the use falls into any of those categories, you can move forward with the use and will not need additional permission.
+
+## Third Party Permission Requests
+
+If questions remain after reviewing the permitted uses page, please submit a request to [Third Party Permissions](mailto:mscrqs@microsoft.com).
+The people supporting this will direct the request depending upon the content.
+
+If a request needs to be submitted to the [Third Party Permissions](mailto:mscrqs@microsoft.com), the request should include the following:
+
+  - A statement that the [Use of Microsoft Copyrighted Material](https://www.microsoft.com/en-us/legal/intellectualproperty/permissions) was reviewed and did not address the situation.
+  - A statement that Microsoft (and not a third party) is the owner of the logo at issue.
+  - Clear identification of the materials to be used (i.e., the picture of the book cover included by the author in the letter request should suffice).
+  - A description, including URLs of how they found or located the logo.
+  - A description of how the party intends to use or distribute the logo (i.e., that it is for the book cover of an instructional book on PowerShell).
+  - A description of how long the party needs to use the logo.