Updating Documentation for KEK Update Process

Author: Flickdm

PostSignedObjects/KEK/Readme.md

@@ -2,8 +2,27 @@
 
 These represent the KEK update files that Microsoft has been collecting from various OEMs.
 
-For Windows based systems these files will be automatically applied during regular
-Secure Boot servicing. 
+## For OEMs
 
-For Linux based systems tooling like `fwupd` will automatically apply these during
-regular Secure Boot servicing.
+If you are an Original Equipment Manufacturer (OEM) and want to contribute your PK-signed KEK
+certificates to this repository, please visit:
+
+**[https://github.com/microsoft/secureboot_objects/wiki/OEM-Certificate-Key-Rolling](https://github.com/microsoft/secureboot_objects/wiki/OEM-Certificate-Key-Rolling)**
+
+This wiki page contains detailed instructions on:
+
+- How to prepare your KEK certificates for submission
+- Required file formats and naming conventions
+- Validation procedures and requirements
+- The pull request submission process
+
+### Important Notes
+
+- **OEM Verification Required**: Microsoft reserves the right to deny pull requests if the
+  contributor cannot be verified as a legitimate OEM
+- **Certificate Validation**: All submitted KEK certificates must be properly signed by the
+  OEM's Platform Key (PK)
+- **Documentation**: Submissions must include proper documentation as described on the wiki
+
+For questions about the submission process, please open an issue in this repository or contact
+Microsoft through official OEM channels.