Added outfile command

Author: Andreas

README.md

@@ -46,4 +46,5 @@ All arguments can be use independently with each other.
 |---|---|---|
 |**--path [-p]**|Specifies the to be used path|`--path=git/tree`|
 |**--level [-l]**|Specifies the depth of the tree|`--level=0`|
+|**--out [-o]**|Specifies the output file|`--out=tree.txt`|
 |**--all [-a]**|Shows all `.*` files and directories|`--all`|