Update various docs (#4)

* rename cli tool

* remove redundant docs

* update docs

* update macos instructions

* add badges

docs/usage.md

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+# Basic Usage
+
+## Chat tab
+
+![chat tab](images/chat-tab.png)
+
+The chat tab is divided into 3 columns:
+
+- Left: Conversation settings
+- Middle: Chat interface
+- Right: Information panel
+
+### Conversation settings
+
+#### Conversation control
+
+Create, rename, and delete conversations.
+
+![covnerstaion control](images/converstaion-control.png)
+
+#### File index
+
+Choose which files to retrieve references from. If no file is selected, all files will be used.
+
+![file index](images/file-index.png)
+
+### Chat interface
+
+Interact with the chatbot.
+
+![chat interface](images/chat-interface.png)
+
+### Information panel
+
+Supporting information such as the retrieved evidence and reference will be displayed
+here.
+
+![info panel](images/info-panel.png)
+
+## File index tab
+
+![file index tab](images/file-index-tab.png)
+
+### File upload
+
+In order for a file to be used as an index for retrieval, it must be processed by the
+application first. Do this uploading your file to the UI and then select `Upload and Index`.
+
+![file upload](images/file-upload.png)
+
+The application will take some time to process the file and show a message once it is
+done. Then you will be able to select it in the [File index section](#file-index) of the [Chat tab](#chat-tab).
+
+### File list
+
+This section shows the list of files that have been uploaded to the application and
+allows users to delete them.
+
+![file-list](images/file-list.png)