docs: update plugin READMEs with new content and corrections

- Revised titles and installation commands for several plugins, including Adjust, AdMob Plus, and Approov Advanced HTTP.
- Added new README files for plugins such as Airship, Audio Management, and Genius Scan.
- Corrected plugin repository links and usage documentation across multiple plugins.
- Updated supported platforms and descriptions for clarity and accuracy.
- Enhanced consistency in formatting and structure throughout the documentation.

docs/plugins/openinstall/README.md

@@ -0,0 +1,20 @@
+# OpenInstall
+
+```
+$ ionic cordova plugin add cordova-plugin-openinstall
+$ npm install @awesome-cordova-plugins/openinstall
+```
+
+## [Usage Documentation](https://danielsogl.gitbook.io/awesome-cordova-plugins/plugins/openinstall/)
+
+Plugin Repo: [https://github.com/openinstall/cordova-plugin-openinstall](https://github.com/openinstall/cordova-plugin-openinstall)
+
+
+
+## Supported platforms
+
+- Android
+  - iOS
+  
+
+