Update README.md

Author: michael-spengler

README.md

@@ -47,7 +47,12 @@ console.log(JSON.stringify(brain, undefined, 2))
 
 ```
 
-## PATRICIA Tries
+## Radix Tree
+A Radix Tree is a compressed version of a trie - see [this introduction](https://www.youtube.com/watch?v=E8ZGt2i3xkw)
+<img width="947" alt="Screenshot 2022-01-07 at 08 50 31" src="https://user-images.githubusercontent.com/43786652/148510487-e0868c68-409e-4d58-9e52-b7c7324ae041.png">
+
+There are several variations of Radix Trees. In some cases there is no consistent naming / definition to be found (yet?).  
+A rather famous variation of a Radix Tree is the PATRICIA Trie:  
 **P** Practical  
 **A** Algorithm  
 **T** To   
@@ -57,7 +62,17 @@ console.log(JSON.stringify(brain, undefined, 2))
 **I** In   
 **A** Alphanumeric  
 
-PATRICIA Tries are Radix Trees with the [radix 2](https://cs.stackexchange.com/questions/63048/what-is-the-difference-between-radix-trees-and-patricia-tries). They became especially famous because in the Ethereum Blockchain pretty much everything (state trie, transaction trie, receipt trie, ...) is stored in PATRICIA Tries. For details I can recommend [this video](https://www.youtube.com/watch?v=OxofT39TJgg).
+PATRICIA Tries are Radix Trees with the [radix 2](https://cs.stackexchange.com/questions/63048/what-is-the-difference-between-radix-trees-and-patricia-tries).  
+[Merkle PATRICIA Tries aka Merkle PATRICIA trees](https://www.skypack.dev/view/merkle-patricia-tree) became especially famous as in the Ethereum Blockchain pretty much everything (state trie, transaction trie, receipt trie, ...) is stored in those kinds of data structures. For details I can recommend [this video](https://www.youtube.com/watch?v=OxofT39TJgg). Keep in mind that (currently) some people use different words for the same thing and some people use the same word for different things in these contexts.
+
+## Merkle PATRICIA Trie / Tree
+
+```ts
+import merklePatriciaTree from 'https://cdn.skypack.dev/merkle-patricia-tree'
+
+// For specific usage examples you might check https://www.skypack.dev/view/merkle-patricia-tree
+```
+
 
 ### Usage Examples
 ... Under Construction ...