Add the readme.

README.md

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+# Lumière (introduction)
+This project aims to deliver a service to stream videos from a server to many devices.
+
+The UI should be very simple and display films and series.
+
+# User types
+There are two types of users:
+- administrator
+  - can manage films and series
+  - can manage users
+- user (simple user)
+  - can watch films and series
+
+# Watching history
+When a user watches a film or a series episode, the application registers each video progress, and if the user has already watched the video or not.
+
+This last indicator can be reset (in case when the user wants to re-watch a series from the beginning).
+
+# Adding films or series
+At the first installation, the administrator has to define a folder path in the `.env` file. This folder path will be designated as "root folder" for the rest of this file.
+
+Film and series files have to be copied in the root folder.
+
+For series, the administrator has to create one folder in the root folder, and one folder inside this per season. 
+
+## Examples
+### Root folder
+`/opt/lumière/files`
+
+### Adding a film
+- Film name: `Lord of the rings 1`
+- Film filename: `lord_of_the_rings_1.mkv`
+- File location: `/opt/lumière/files/lord_of_the_rings_1.mkv`
+
+### Grouping films
+To group films, create a folder in the root folder, and put the film files in it.
+
+- Films to group:
+  - `Lord of the rings 1`
+    - Film filename: `lord_of_the_rings_1.mkv`
+    - File location: `/opt/lumière/files/lord_of_the_ring/lord_of_the_rings_1.mkv`
+  - `Lord of the rings 2`
+      - Film filename: `lord_of_the_rings_2.mkv`
+      - File location: `/opt/lumière/files/lord_of_the_ring/lord_of_the_rings_2.mkv`
+  - `Lord of the rings 3`
+      - Film filename: `lord_of_the_rings_3.mkv`
+      - File location: `/opt/lumière/files/lord_of_the_ring/lord_of_the_rings_3.mkv`
+
+### Series
+Do the same thing as grouping films, but create sub folders for each season in the series name.
+
+- Series name: `Young Sheldon`
+  - Season 1:
+    - Episode 1
+      - Filename: `young_sheldon_S1_E1.mkv`
+      - File location: `/opt/lumière/files/young_sheldon/season_1/young_sheldon_S1_E1.mkv`
+    - Episode 2
+        - Filename: `young_sheldon_S1_E2.mkv`
+        - File location: `/opt/lumière/files/young_sheldon/season_1/young_sheldon_S1_E2.mkv`
+    - etc.
+  - Season 2:
+      - Episode 1
+          - Filename: `young_sheldon_S2_E1.mkv`
+          - File location: `/opt/lumière/files/young_sheldon/season_2/young_sheldon_S2_E1.mkv`
+
+# Adding film or series covers
+Just put the picture's file aside the film or series episode video file.
+
+## Example
+- Film name: `Lord of the rings 1`
+- Film filename: `lord_of_the_rings_1.mkv`
+- File location: `/opt/lumière/files/lord_of_the_rings_1.mkv`
+- Cover filename: `lord_of_the_rings_1.png`
+- Cover file location: `/opt/lumière/files/lord_of_the_rings_1.png`