Create TF-1641-user-can-view-all-messages-of-one-label.md (#1669)

(cherry picked from commit 97e775fc51668d6fb9d014fcb24dcbb23978293a)

docs/stories/EPIC-Label/TF-1641-user-can-view-all-messages-of-one-label.md

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+# Summary
+
+* [Related EPIC](#related-epic)
+* [Definition](#definition)
+* [Screenshots](#screenshots)
+* [Misc](#misc)
+
+## Related EPIC
+
+https://github.com/linagora/tmail-flutter/issues/1638
+
+## Definition
+**UC1. Web browser**
+- Given that I am a Tmail user and I have logged in successfully
+- I  click on one label in left panel, then the screen that listing all emails which have this label will be shown
+- Or in the content view of an email, when I hover the label, there wull be a tooltip saying :"Go to label"
+- I click on the label, then the screen listing all emails which have this label is displayed.
+- On this email list, I can see the name of original mailbox of each email on the list 
+
+**UC2. Mobile**
+
+- Given that I am a Tmail user and I have logged in successfully
+- When I click on the folder name in top of screen, the list of folders screen is opened, I can see a label list
+- I click on one label in the list, then the sytem will display all emails which have this label on the screen
+- The screen's title is changed to selected label. 
+
+
+[Back to Summary](#summary)
+
+## Screenshots
+
+![image](https://user-images.githubusercontent.com/68209176/228921162-5033893b-60fa-4ee0-bc8f-d0503b46617f.png)
+
+
+![image](https://user-images.githubusercontent.com/68209176/228170226-dafddf6c-21bd-4ff5-a2fc-055d93de8fb0.png)
+
+### Mobile 
+
+
+![Group 768](https://user-images.githubusercontent.com/68209176/231079344-c8329179-6b56-49df-9dce-3bd2b646b70f.png) ![Group 769 (1)](https://user-images.githubusercontent.com/68209176/231079508-ef71c541-ed12-4b74-8bb9-8ca0f2cefdee.png)
+
+
+
+[Back to Summary](#summary)
+
+## Misc
+
+None
+
+[Back to Summary](#summary)