final version for now!

README.md

@@ -1,2 +1,64 @@
 # h2tomysql
+
 migrate database from h2 to mysql using python and bash
+
+## h2tomysql goal
+
+It's not a tool that will do everything, it's more an example (and not the best some refactoring will be needed to have a cleaner code!)
+It can help someone that wants to automate the h2 to mysql migration and doesn't know how to start or how to do it.
+If it knows python it can help because the code doesn't deal with all cases and some specific errors can occur like overpassing the
+mysql column size limited to 65535 if you have many VARCHAR in your create tables, I managed here only some cases with VARCHAR(4000), VARCHAR(10000) and VARCHAR(20000).
+It's not for production purpose!
+
+The bash script downloads the h2 driver and exports the h2 database that should exist in the directory which you execute this command.
+The python script analyzed the h2 script and create a mysql script in output that can be used to import into mysql.
+
+I tested only with 3 different h2 database that I found some issues depending the h2 script generated.
+I imported my 3 h2 databases into mysql 8.0.25.
+
+    Thanks to Jonas Verhoelen article, it helps me to  start : https://jonas.verhoelen.de/databases/dump-sql-h2-database-file/
+     in this example I dealt with migrating 3 different h2 database to have some different kinds of scripts to manage
+    do not forget to adapt the user and/or password to access to h2 database here "secret" as example
+
+## h2tomysql usage
+
+### h2tomysql.sh
+
+    first step is to call this small bash that will download the driver sql connect to database in the current directory and generate the h2 script
+
+sh ./h2tomysql.sh
+
+### h2tomysql.py
+
+    second step is to call the python program that parses the h2 script and generate a compatible script for mysql.
+
+python3 h2tomysql.py --help
+
+    H2ToMysql is a python3 program that helps to generate a sql script for import into mysql database.
+    H2ToMysql uses Python3
+    H2ToMysql tested with mysql 8.0.25
+    _____________________________________________________________________________________________________
+    WARNING : it doesn't deal with all cases, probably you need to adapt the code to your specific needs!
+    _____________________________________________________________________________________________________
+    For linux and linux-like OS that have the pre-requisites
+    Usage: h2tomysql [options] fromfile tofile
+    Required : fromfile  is the file that has the h2 script
+    Required : tofile    is the result file that will contain compliant mysql script
+    Options:
+    -V, --version        Display version number of PyToC compiler
+    -H, --help           Display this help
+    __________________________________________
+    Enjoy!
+
+python3 h2tomysql.py --version
+H2ToMysql version 1.0.0
+
+example : supposing you generated a h2.sql that contains the export of h2 script. the command creates a mysql.sql that removes some keywords not allowed with mysql and removes also the comments and the create sequence
+Do not forget to use first the h2tomysql.sh to generate your h2.sql (change the name into the bash script)
+python3 h2tomysql.py h2.sql mysql.sql
+
+## How to improve it
+
+    * using variables in the bash script and calling the python script directly from the bash script to avoid 2 commands to call
+    * refactoring bash script to use some variables and avoid to repeat the h2 script name hard-coded
+    * refactoring python code to clean it and be more readable and friendly