docs: add a CHANGELOG file

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [Unreleased]
+
+
+## [1.1.0-rc1] - 2020-08-19
+### Added
+- geOrchestra plugin: automatically associate role to users when the user database is synchronised (see 
+[geOrchestra plugin](plugin_georchestra/README.md))
+- add a function to search for places and addresses in the interactive maps. This new feature comes with new settings:
+`GEOCODER_PROVIDERS` and `SELECTED_GEOCODER`
+- add a button to for feature creation in a feature detail page
+- add a function in the Django admin page of the feature type for creating a SQL view
+- add a `FAVICON_PATH` setting. Default favicon is the Neogeo Technologies logo
+
+### Changed
+- enable edition of a feature type if there is not yet any feature associated with it
+- sort users list by last_name, first_name and then username
+- change the label of the feature type field `title` in the front-end form (Titre -> Nom)
+- change the data model for basemaps: one basemap may contain several layers. Layers are declared by GéoContrib
+admin users. Basemaps are created by project admin users by selecting layers, ordering them and setting the opacity
+of each of them. End users may switch from one basemap to another in the interactive maps. One user can change 
+the order of the layers and their opacity in the interactive maps. These personnal adjustments are stored in the 
+web browser of the user (local storage) and do not alter the basemaps as seen by other users.
+- change default value for `LOGO_PATH` setting: Neogeo Technologie logo. This new image is located in the media 
+directory.
+- change all visible names in front-end and docs from `Geocontrib` to `GéoContrib`
+- set the leaflet background container to white
+- increase the width of themap in feature_list.html
+
+### Fixed
+- fix tests on exif tag extraction
+- fix serialisation of field archieved_on of features
+- use https instead of http on link to sortable.js
+- fix typos: basemaps management error message
+- fix visibility of draft features
+
+### Security
+- upgrade Pillow from 6.2.2 to 7.2.0 (Python module used for exif tags extraction)