updated readme with guide to use git submodule and gradle implement the external module

README.md

@@ -10,3 +10,19 @@
 ```shell
 git clone https://git.cubetiqs.com/CUBETIQ/sample-modules.git --recurse-submodules --remote-submodules
 ```
+
+### Add Submodule by using git submodule (Example)
+```shell
+git submodule add https://git.cubetiqs.com/CUBETIQ/gradle-sample-module-example.git
+```
+
+### Register module in ```settings.gradle.kts``` or ```settings.gradle```
+```gradle
+rootProject.name = "sample-modules"
+include("gradle-sample-module-example")
+```
+
+### Implementation module in ```build.gradle.kts```
+```gradle
+implementation(project(":gradle-sample-module-example"))
+```