(docs): add simple example for shebang support across some common lan…

…guages

examples/shebang.md

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+# Runme Language Support
+
+By default Runme can run everything that is also installed on your machine.
+
+## Like Python:
+
+```py
+print("Hello Pythonista 🐍")
+```
+
+## maybe Ruby?
+
+```rb
+puts "Hello Ruby ♦️"
+```
+
+## or JavaScript:
+
+```js
+console.log("Always bet on JS!")
+```
+
+## even TypeScript:
+
+Make sure you have `ts-node` installed globally:
+
+```sh
+npm i -g ts-node
+```
+
+then run:
+
+```ts
+const myVar: string = 'I am a typed string!'
+console.log(myVar)
+```
+
+## Java
+
+```java
+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
+```