Add crontab documentation

README.md

@@ -113,7 +113,7 @@ Notification Body
 **Required:** Yes
 **Placeholder Available:** Yes
 
-# Usage - Local
+## Usage - Local
 Makefile and instruction bellow expected you uses python3. 
 It also expected you already have a chrome webdrive installed. 
 
@@ -122,19 +122,65 @@ It also expected you already have a chrome webdrive installed.
 3. Edit ``src/settings/local.py`` file with your information.
 4. Run ``python3 src/app.py local`
 
-# Integrations Placeholder
+## Integrations Placeholder
 Some integration fields accept placeholder, that means you can use internal fields used on integration on your texts.
 Fields that accept placeholders are marked on **Env Variables** of each integration.
 
-## Placeholder syntax
+### Placeholder syntax
 ``%(placeholderName)s``
 Example:
 ``This is my holerite at %(search_year)s/%(search_month)s``
 
-## Available placeholders
+### Available placeholders
 - search_year
 - search_month
 
+## Crontab
+
+First create bash like this:
+````bash
+#!/bin/bash
+SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
+
+# print current date at log
+date
+
+# GET LAST MONTH YEAR AND MONTH
+LAST_MONTH_YEAR=$(perl -MPOSIX=strftime -le '@t = localtime; $t[3] = 1; $t[5]--; print strftime("%Y", @t)')
+LAST_MONTH_MONTH=$(perl -MPOSIX=strftime -le '@t = localtime; $t[3] = 1; $t[4]--; print strftime("%m", @t)')
+
+# try 5 times
+n=0
+until [ $n -ge 5 ]
+do
+    echo "trying $n"
+    /usr/local/bin/docker run --env-file "$SCRIPTPATH/env-configs" \
+    -e RH_SEARCH_YEAR="$LAST_MONTH_YEAR" \
+    -e RH_SEARCH_MONTH="$LAST_MONTH_MONTH" \
+    viniciusgava/portaldorh-holerite-download:latest 2>&1 && break
+    n=$[$n+1]
+    sleep 15
+done
+
+````
+**Mac tip:** You must to pass docker full path to works at crontab
+``/usr/local/bin/docker``
+
+Second add all env variables at ``env-configs``.
+Example:
+ ````bash
+RH_USERNAME='YOUR USERNAME HERE'
+RH_PASSWORD='YOUR PASSWORD HERE'
+````
+
+Then run ``crontab -e`` and add the follow cron.
+Example:
+````bash
+0 8 7 * * sh ~/automate/holerite/run.sh  >> ~/automate/holerite/holerite.log
+````
+The example bellow runs 8am of day 7 of every month. 
+You can generate a different crontab config on [https://crontab-generator.org](https://crontab-generator.org) 
+
 ## Links
 - [GitHub](https://github.com/viniciusgava/portaldorh-holerite-download)
 - [Docker Hub](https://hub.docker.com/r/viniciusgava/portaldorh-holerite-download/)