Add Introduction and The Libary and the bot section

TelegramBots.wiki/understanding-the-library/Understanding-The-Library.md

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+# Understanding the Library
+
+This little handy guide will not teach you how to a particular thing in the library. 
+It will also not teach you how to create bots or anything in the liking of that. 
+For that take a look at the Getting Started guide
+
+This guide will give you a general understanding on how the library function and will answer a lot of frequently 
+asked questions. I recommend everyone who wants to work with this library more to read this guide.
+
+## Topics
+* The library and the bot API
+* Understanding how the API is mapped in the library
+* The general infrastructure of the library
+
+## The Library and the Bot API
+Often in Conversations about the library they talk about the API or Application Programming Interface. Sometimes these 
+terms are used interchangeably, which is not correct.
+
+To understand the differences between those two things lets take a look at this diagram
+
+![](Telegram-Diagram.png)
+
+As you might have noticed. Our bot never actually talks to the user directly. Actually, Every communication between user 
+and bot happens on the Telegram Servers (A little disclaimer. I actually don't know the entire infrastructure of telegram. 
+So take everything between Bot API and Telegram Client with a grain of salt)
+
+Important is that the Library communicates with the Telegram Bot API for everything. Sending Messages, Sending Pictures, 
+and receiving Updates from Telegram
+
+So we can conclude that the Library is the part of your code that handles all the communication between your bot and the
+Bot API. The Bot API is the actual interface telegram offers to implement bots. Everything we can do in the library, 
+we can also do directly calling the library.
+
+Take this piece of code:
+```java
+AbsSender ourBot = getOurBot();
+
+GetMe getMe = new GetMe();
+
+User bot = ourBot.execute(getMe);
+```
+
+If we do this for one of our bots this is what theBot will look like:<br>
+![](Bot_intellij.png)
+
+(you better be grateful for that picture. Spend an eternity trying to find a username)
+
+We can also go ahead and just call the bot api directly:<br>
+![](Bot_curl.png)
+
+We get the same result. The library just handily maps it to an object for us to work with.
+
+So how do we find out how to do things with the library?
+
+## Understanding how the API is mapped in the library