docs: update wrt 0.2

Author: TomasTomecek

README.md

@@ -111,6 +111,7 @@ N      previous search occurrence
 f4     display only lines matching provided query (provide empty query to clear filtering)
         * main listing provides additional filtering (for more info, check Listing Section)
         * example query: "fed" - display lines containing string "fed"
+f5     open a tree view of all images (`docker images --tree` equivalent)
 ctrl o next buffer
 ctrl i previous buffer
 x      remove buffer
@@ -150,6 +151,7 @@ f4     display only lines matching provided query (provide empty query to clear
 ```
 i      inspect image
 d      remove image (irreversible!)
+enter  display detailed info about image (when layer is focused)
 ```
 
 ## Container commands in listing
@@ -167,6 +169,21 @@ u      unpause container
 X      kill container
 ```
 
+## Tree buffer
+
+```
+enter  display detailed info about image (opens image info buffer)
+```
+
+## Image info buffer
+
+```
+d      remove image tag (when image name is focused)
+enter  display detailed info about image (when layer is focused)
+i      inspect image (when layer is focused)
+```
+
+
 # Why I started sen?
 
 Since I started using docker, I always dreamed of having a docker TUI. Something like [tig](https://github.com/jonas/tig), [htop](http://hisham.hm/htop/) or [alot](https://github.com/pazz/alot). Some appeared over time. Such as [docker-mon](https://github.com/icecrime/docker-mon) or [ctop](https://github.com/yadutaf/ctop). Unfortunately, those are not proper docker TUIs. They are meant for monitoring and diagnostics.