Update Readme

Author: mobizt

README.md

@@ -683,3 +683,18 @@ For Gmail usage, setting 1024 bytes for both buffers i.e. `ESP_SSLClient::setBuf
 In addition, please don't forget to set the network client with `ESP_SSLClient::setClient()` and also `ESP_SSLClient::setInsecure()` when the server SSL certificate was not assigned for verification.
 
 Anyway, for IMAP usage, the memory allocation may fail and get stuck when fetching the message body that requires more memory in the process, the core SSL client i.e. `WiFiSSLClient` is recommeneded for those devices in this case.
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+# License #
+
+The code samples in this repository are licensed under the MIT License. 
+
+Copyright (c) 2025, Suwatchai K. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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+Last updated 2025-05-25 UTC.