Added 7x20 motor datasheet

src/products/motor-4x-7x20mm/datasheet/index.md

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+---
+layout: datasheet-base
+title: 4 x 7x20 mm DC-motor
+sku: 114992987
+version: 1
+status: active
+---
+
+{% datasheet_intro 4x_7x20mm_DC_motor_400px.JPG; %}
+Pack of 4 upgrade 7x20 mm brushed coreless DC-motors for Crazyflie 2.X.
+{% enddatasheet_intro %}
+
+## Mechanical specifications
+
+* Diameter: 7.0 mm
+* Length: 20.0 mm
+* Shaft length: 5 mm
+* Shaft diameter: 1 mm
+* Weight: 3.6 g
+* Wire length: 32.0 mm
+* Molex picoblade 2P connector
+
+## Electrical specifications
+
+* Kv: 13 000 rpm/V (±15%)
+* Rated voltage: 3.4V DC
+* Rated current: 2600mA (max)
+* Terminal resistance: 0.75 Ω (±20%)
+
+## Package contents
+
+* 4 x 7x20 mm DC-motor with connector
+
+## History
+
+| Version | Comment | Date |
+| ------- | ------- | ---- |
+| 1 | Initial release | 2022-11-28 |