README-dev: Explicit how to run deposit in dev/prod mode locally

README-dev.md

+swh-deposit
+==============
+
+There are 2 modes.
+
+# Development like
+
+## Configuration
+
+In ~/.config/swh/deposit/server.yml
+
+``` YAML
+# dev option
+host: 127.0.0.1
+port: 5006
+
+# production
+authentication: true
+
+# 20 Mib max size
+max_upload_size: 20971520
+
+verbose: false
+noop: false
+
+objstorage:
+  cls: pathslicing
+  args:
+    root: /home/storage/swh-deposit/uploads
+    slicing: 0:1/1:5
+```
+
+## Run
+
+Run local server which will use the previous setup.
+
+``` Shell
+make run-dev
+```
+
+# Production-like
+
+This will run locally a mode similar to that of production.
+
+## Configuration
+
+This expects the same file describes in the previous chapter.  Plus,
+an additional private settings.yml file containing secret information
+that is not in the source code repository.
+
+In ~/.config/swh/deposit/private.yml, something like:
+
+``` YAML
+secret_key: production-local
+db:
+  name: swh-deposit-dev
+```
+
+## Run
+
+``` Shell
+make run
+```
+
+Note: This expects gunicorn3 package installed on the system.
+
+
+## Tests
+
+``` Shell
+cd swh && python3 -m manage test
+```