update readme

README.md

@@ -4,6 +4,7 @@ Customizable script for exporting notes from BookStack through API
 #### Features:
 - export keeping the tree structure by making folders from Shelves, Books and Chapters
 - export multiple formats at once
+- export at multiple levels at once (export Books or/and Chapters or/and Pages as files)
 - customizable path for placing exported notes
 - authorization token is loaded from txt file
 
@@ -13,9 +14,14 @@ Requirements:
 Full example on how to use the script:
 1. Clone the repo 
 2. next to the script place token.txt file containing token id and token secret in format: TOKEN_ID:TOKEN_SECRET
-3. in the same directory run the command, specifying your app domain with https prefix:
+3. in the same directory run the command, specifying your app domain with https prefix (every parameter is optional as it have default value, this is a full possible example):
 ```bash
-python exporter.py -H https://wiki.example.com -f pdf,md,plaintext,html -t ./token.txt -p ./
+python exporter.py \
+    -H https://wiki.example.com \
+    -f pdf,md,plaintext,html \
+    -l pages,chapters,books
+    -t ./token.txt \
+    -p ./ 
 ```
 
 Customization:
@@ -30,10 +36,15 @@ Customization:
   -f FORMATS, --formats FORMATS
                         Coma separated list of formats to use for export. Available ones: md,plaintext,pdf,html
                         Default: md
+  -l LEVEL, --level LEVEL
+                        Coma separated list of levels at which should be export performed. 
+                        Available levels: ['pages', 'chapters', 'books']
+                        Default: pages
+
 ```
 
 ### TODO:
 - choosing verbosity level through command line parameter
-- choosing on what level should the notes be exported (Books, Chapters, Pages)
+- ~~choosing on what level should the notes be exported (Books, Chapters, Pages)~~ Done
 - (optional) choosing if update note file only if the last edit timestamp from API is later that the local file timestamp
 - suggestions?