- Added README.fr.md in the root folder

- Translated the whole leçon 2.1 <predict plant growth>

2-farm/lessons/1-predict-plant-growth/README.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/README.fr.md)
 # Predict plant growth with IoT
 
 ![A sketchnote overview of this lesson](../../../sketchnotes/lesson-5.jpg)

2-farm/lessons/1-predict-plant-growth/assignment.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/assignment.fr.md)
 # Visualize GDD data using a Jupyter Notebook
 
 ## Instructions

2-farm/lessons/1-predict-plant-growth/pi-temp.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/pi-temp.fr.md)
 # Measure temperature - Raspberry Pi
 
 In this part of the lesson, you will add a temperature sensor to your Raspberry Pi.

2-farm/lessons/1-predict-plant-growth/single-board-computer-temp-publish.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/single-board-computer-temp-publish.fr.md)
 # Publish temperature - Virtual IoT Hardware and Raspberry Pi
 
 In this part of the lesson, you will publish the temperature values detected by the Raspberry Pi or Virtual IoT Device over MQTT so they can be used later to calculate GDD.

2-farm/lessons/1-predict-plant-growth/virtual-device-temp.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/virtual-device-temp.fr.md)
 # Measure temperature - Virtual IoT Hardware
 
 In this part of the lesson, you will add a temperature sensor to your virtual IoT device.

2-farm/lessons/1-predict-plant-growth/wio-terminal-temp-publish.md

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+[![French](https://img.shields.io/badge/-French-purple)](translation/wio-terminal-temp-publish.fr.md)
 # Publish temperature - Wio Terminal
 
 In this part of the lesson, you will publish the temperature values detected by the Wio Terminal over MQTT so they can be used later to calculate GDD.

2-farm/lessons/1-predict-plant-growth/wio-terminal-temp.md

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+[![French](https://img.shields.io/badge/-French-purple)](translations/wio-terminal-temp.fr.md)
 # Measure temperature - Wio Terminal
 
 In this part of the lesson, you will add a temperature sensor to your Wio Terminal, and read temperature values from it.

README.md

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 [![Bengali](https://img.shields.io/badge/-Bengali-blue)](translations/README.bn.md)
 [![Chinese](https://img.shields.io/badge/-Chinese-yellow)](translations/README.zh-cn.md)
 [![Turkish](https://img.shields.io/badge/-Turkish-darkgreen)](translations/README.tr.md)
+[![French](https://img.shields.io/badge/-French-purple)](translations/README.fr.md)
 
 # IoT for Beginners - A Curriculum