Feature: multiple kubel buffers (abrochard#114)

* Multi buffers support (take abrochard#57 and rebase)

* Add kubel--read-buffer, improve kubel-refresh and kubel command

---------

Co-authored-by: Diego Alvarez <diego.canada@icloud.com>
Co-authored-by: Adrien Brochard <abrochard@users.noreply.github.com>

README.md

@@ -25,6 +25,7 @@ We now support managing pretty much any resource!
 - exec into a pod using tramp
 - quick run shell-command
 - scale replicas
+- multiple kubel buffers, each one with different context, namespace, and resource.
 
 ## Installation
 
@@ -76,6 +77,11 @@ To programmatically open a session for a specific context/namespace/resource, ca
 (kubel-open "<context>" "<namespace>" "<OPTIONAL resource>")
 ```
 
+Each kubel buffer will automatically be renamed using the following template:
+```
+*kubel session: |<context>|<namespace>|<resource>|*
+```
+
 ## Shortcuts
 
 On the kubel screen, place your cursor on a resource