Add documentation about minimal requirement

README.md

@@ -8,10 +8,10 @@
 Leshan provides libraries which help people to develop their own Lightweight M2M server and client.  
 The project also provides a client, a server and a bootstrap server demonstration as an example of the Leshan API and for testing purpose.
 
-| LWM2M Version <br> Targeted | Leshan  <br> Version | Minimal <br> Java Version | Development <br> State |  Build Status	|  Standalone <br> Demos |
+| LWM2M Version <br> Targeted | Leshan  <br> Version | Minimal <br> Java Version | Development <br> State |  Build Status   |  Standalone <br> Demos |
 | - | - | - | - | - | - |
-| [v1.0.x](https://github.com/eclipse/leshan/wiki/Lightweight-M2M-Specification#lightweight-m2m-v10x) | [v1.x](https://github.com/eclipse/leshan/tree/1.x) <br/> [Supported features](https://github.com/eclipse/leshan/wiki/LWM2M-Supported-features) | Java 7 | stable released | [jenkins-1.x](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/) | [server-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-server.jar)<br/> [client-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-client.jar) <br/> [bsserver-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-bsserver.jar) |
-| [**v1.1.x**](https://github.com/eclipse/leshan/wiki/Lightweight-M2M-Specification#lightweight-m2m-v11x)| [**v2.x** (master)](https://github.com/eclipse/leshan/tree/master) <br/> [Supported features](https://github.com/eclipse/leshan/wiki/LWM2M-1.1-supported-features) | Java 8 | **in development**  |[jenkins-master](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/)     | [server-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-server.jar)<br/> [client-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-client.jar) <br/> [bsserver-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-bsserver.jar)  |
+| [v1.0.x](https://github.com/eclipse/leshan/wiki/Lightweight-M2M-Specification#lightweight-m2m-v10x) | [v1.x](https://github.com/eclipse/leshan/tree/1.x) <br/> [Supported features](https://github.com/eclipse/leshan/wiki/LWM2M-Supported-features) | Java 7 ([more details](https://github.com/eclipse-leshan/leshan/tree/1.x/documentation/Requirement.md)) | stable released | [jenkins-1.x](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/) | [server-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-server.jar)<br/> [client-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-client.jar) <br/> [bsserver-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/1.x/lastSuccessfulBuild/artifact/leshan-demo-bsserver.jar) |
+| [**v1.1.x**](https://github.com/eclipse/leshan/wiki/Lightweight-M2M-Specification#lightweight-m2m-v11x)| [**v2.x** (master)](https://github.com/eclipse/leshan/tree/master) <br/> [Supported features](https://github.com/eclipse/leshan/wiki/LWM2M-1.1-supported-features) | Java 8 ([more details](./documentation/Requirement.md)) | **in development**  |[jenkins-master](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/)     | [server-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-server.jar)<br/> [client-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-client.jar) <br/> [bsserver-demo](https://ci.eclipse.org/leshan/job/leshan-ci/job/master/lastSuccessfulBuild/artifact/leshan-demo-bsserver.jar)  |
 
 
 Release (stable and milestones) are available on [maven central](https://search.maven.org/search?q=org.eclipse.leshan).  

documentation/Requirement.md

@@ -0,0 +1,14 @@
+# Minimal Requirement for Leshan. 
+
+## Leshan 2.x
+
+| Component | Minimal Requirement |
+| - | - |
+| Maven Build | Maven 3.6.0 </br> Java 17|
+| Leshan library | Java 8 |
+| Leshan client demo | Java 8 |
+| Leshan server  demo | Java 17 (because of [jetty 12](https://jetty.org/docs/jetty/12/index.html) dependency) |
+| Leshan bsserver  demo | Java 17 (because of [jetty 12](https://jetty.org/docs/jetty/12/index.html) dependency) |
+
+## Leshan 1.x
+see [leshan 1.x documentation](https://github.com/eclipse-leshan/leshan/tree/1.x/documentation/Requirement.md).