doc: added example file and enhanced README description

Author: DahlitzFlorian

README.md

@@ -8,4 +8,13 @@ Feel free to use it.
 
 ## Usage
 Simply create some text-file w/ the tweets in it separated by `§§§`. Run the script with:<br>
-`twitter-bot.py <file> <number of seconds to wait>`
+`twitter-bot.py <file> <number of seconds to wait>`
+
+Given the `example.txt` file containing two sample tweets, you can call
+the script as follows:
+
+```bash
+python twitter-bot.py example.txt 10
+```
+
+This will publish both tweets with ten seconds between each.

example.txt

@@ -0,0 +1,10 @@
+First tweet this day!
+
+#100DaysOfCode | #coding | #Python
+
+§§§
+
+Second tweet, which is separated by the first one using the given separator!
+Coding is fun.
+
+#coding | #Python