Create BSLManager.md

BSLManager.md

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+# BSLManager
+
+A CLI is provided in the Docker image so that admins can manage their instance. 
+
+## Access to the CLI
+
+Since the CLI is packaged into the docker image, you'll have to open a shell from the container. To do so, list first your running containers: 
+
+```
+docker ps
+```
+
+This should display you something equivalent to this:
+
+```
+CONTAINER ID   IMAGE                               COMMAND                  CREATED       STATUS       PORTS                           NAMES
+3734c41af5a7   postgres:9.6                        "docker-entrypoint.s…"   2 weeks ago   Up 2 weeks   5432/tcp                        db_1
+be6870fe103e   nicolasconstant/birdsitelive:latest "dotnet BirdsiteLive…"   6 weeks ago   Up 2 weeks   443/tcp, 0.0.0.0:5000->80/tcp   birdsitelive
+```
+
+Find the BSL container and keep the ID, here it's `be6870fe103e`. And you only need the three first char to identify it, so we'll be using `be6`.
+
+Then open a shell inside the container (change `be6` with your own id):
+
+```
+docker exec -it be6 /bin/bash
+```
+
+And you should now be inside the container, and all you have to do is calling the CLI:
+
+```
+./BSLManager
+```
+
+## Setting up the CLI
+
+The manager will ask you to provide information about the database and the instance. 
+Those must be same than the ones in the `docker-compose.yml` file.
+Provide the information, review it and validate it. Then the CLI UI should shows up. 
+
+## Using the CLI
+
+You can navigate between the sections with the arrows and tab keys. 
+
+The **filter** permits to filter the list of users with a pattern. 
+
+All users have their followings count provided next to them. 
+You can select any user by using the up/down arrow keys and hitting the `Enter` key, this will display more information about the user.
+You can also remove a user and all their followings by hitting the `Del` key. You will be prompted by a confirmation message, and you'll be able to remove this user.