add examples readme and add title to example apps

examples/README.md

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+# Examples
+
+Run example applications with `OverlayScrollbars`.  
+
+> __Note__: All commands must be executed from the root directory of the repository unless stated differently. 
+
+## Install and Build
+
+Before you can start any application you have to install all dependencies and build the library:
+
+1. `npm i`
+2. `npm run build:os`
+
+## Run Example
+
+The following examples are available:
+
+| App  | Command |
+| :--- | :--- |
+| React | `npm run example:react` |
+| Vue | `npm run example:vue` |
+| Angular | `npm run example:ngx` |
+| Svelte | `npm run example:svelte` |
+| Solid | `npm run example:solid` |