Merge pull request #6 from lpoaura/updatedoc

update doc

docs/source/installation.md

@@ -3,9 +3,49 @@
 ## Installation
 
 ```bash
+python3 venv weatherlink_venv
 pip install weatherlink2pg
 ```
 
 ## Usage
 
-Coming soon...
+Usage require some variable environment as mentionned in file `.env.sample`
+for weatherlink api authentication and database connection.
+
+### Full download
+
+Required as first launch
+
+```sh
+source weatherlink_env/bin/activate
+source <env file>
+weatherlink2pg full
+```
+
+### Update
+
+```sh
+source weatherlink_env/bin/activate
+source <env file>
+weatherlink2pg update
+```
+
+### crontask
+
+recommanded way to update data using cron tasks
+
+Create a script with the following code
+
+```bash
+#!/bin/bash
+
+SCRIPT_RELATIVE_DIR=$(dirname "${BASH_SOURCE[0]}")
+
+source $SCRIPT_RELATIVE_DIR/bin/activate
+
+set -a # automatically export all variables
+source  $SCRIPT_RELATIVE_DIR/.weatherlink2pg.env
+set +a
+
+weatherlink2pg update
+```