added docs for integrated stepper drivers

docs/simplefoc_library/hardware/drivers/stepper_drivers.md

@@ -32,6 +32,12 @@ Examples | Description | Specifications | Link | Price
 [<img src="extras/Images/shiled_stepper3.jpg" style="height:100px">](https://www.ebay.com/itm/Motor-Stepper-Servo-Robot-Shield-for-Arduino-I2C-v2-Kit-w-PWM-Driver-TOP/201415058167?hash=item2ee545e2f7:g:IkgAAOSwJ-5aTI4Q)| Arduino Motor Drive Shield V2| - TB6612 chip <br> - 1 motor <br>- 5V-35V <br> - 1.2A (3A peak) | [Ebay](https://www.ebay.com/itm/Motor-Stepper-Servo-Robot-Shield-for-Arduino-I2C-v2-Kit-w-PWM-Driver-TOP/201415058167?hash=item2ee545e2f7:g:IkgAAOSwJ-5aTI4Q) | 25€
 [<img src="extras/Images/shield_monster.jpg" style="height:100px">](https://www.ebay.com/itm/L298N-Dual-VNH2SP30-Stepper-Motor-Driver-Module-30A-Monster-Moto-Shield-Replace/112031018900?hash=item1a1591af94:g:R4YAAOSwEaBaTafh)| Arduino Monster motor shield| - VNH2SP30  chip <br> - 1 motor <br>- 5V-16V <br> - 14A (30A peak) | [Ebay](https://www.ebay.com/itm/L298N-Dual-VNH2SP30-Stepper-Motor-Driver-Module-30A-Monster-Moto-Shield-Replace/112031018900?hash=item1a1591af94:g:R4YAAOSwEaBaTafh) | 8€
 
+<span class="simple">Simple<span class="foc">FOC</span>library</span> will also support some fully integrated solutions
+
+Examples | Description | Specifications | Link | Price
+---- | ---- | ---- | ---
+[<img src="extras/Images/smartstepper.png" style="height:100px">](https://fr.aliexpress.com/item/1005002994341057.html?spm=a2g0o.productlist.0.0.6b7c1dc3oF0O7M&algo_pvid=211a8bd5-fe47-4797-aab2-afb283ded43b&algo_exp_id=211a8bd5-fe47-4797-aab2-afb283ded43b-37&pdp_ext_f=%7B%22sku_id%22%3A%2212000023120630182%22%7D)| Misfit Smart Stepper| - samd21 mcu <br> - A4954 driver chip <br> - Easy install om NEMA17 <br> - AS5047A sensor integrated <br> - 1 motor <br>- 8V-32V <br> - 2A | [AliExpress](https://fr.aliexpress.com/item/1005002994341057.html?spm=a2g0o.productlist.0.0.6b7c1dc3oF0O7M&algo_pvid=211a8bd5-fe47-4797-aab2-afb283ded43b&algo_exp_id=211a8bd5-fe47-4797-aab2-afb283ded43b-37&pdp_ext_f=%7B%22sku_id%22%3A%2212000023120630182%22%7D)<br> [MisfitTech](https://misfittech.net/nema-17-smart-stepper/) | 20-40€
+[<img src="extras/Images/BIGTREETECH_S42B_v1.1.png" style="height:100px">](https://fr.aliexpress.com/wholesale?catId=0&initiative_id=SB_20211004101249&SearchText=BIGTREETECH+S42B)| BIGTREETECH S42B |  - stm32 mcu <br> - 2x A4950 driver chips <br> - Easy install om NEMA17 <br> - TLE5012 sensor integrated <br> - 1 motor <br>- 12V-24V <br> - 2A <br> [see comunity post](https://community.simplefoc.com/t/running-simplefoc-on-a-bigtreetech-s42b/736) | [AliExpress](https://fr.aliexpress.com/wholesale?catId=0&initiative_id=SB_20211004101249&SearchText=BIGTREETECH+S42B) <br>[Amazon](https://www.amazon.fr/BIGTREETECH-commande-emp%C3%AAche-limpression-multiples/dp/B08JLN4PJR/ref=sr_1_5?__mk_fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=BIGTREETECH+S42B&qid=1633371175&qsid=259-6486797-8245010&sr=8-5&sres=B08JLN4PJR%2CB0991B8ZRL%2CB0882QGFZR%2CB07WC71M4R%2CB08182XHZZ%2CB091M7MDS3%2CB08BR7WMS7%2CB08VRM44Z2%2CB097Y5N5KG%2CB07WPY4979%2CB07TJWSV51%2CB089SPPGKJ%2CB08N6C9XCL%2CB08FHM91F2%2CB08B67DHWZ%2CB08ZSD3QBP%2CB08B1G8W39%2CB097RBJ3YR%2CB07W1Q42KK%2CB08VS8PJX7) | 20-40€
 
 Alternatively, you can use two DC motor driver boards, one for each phase of the motor. Here are some examples: