Add README and LICENSE

README.md

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+# SmartKnob
+
+Coming soon...
+
+# Hardware
+
+## Designs
+
+### SmartKnob View
+Premium SmartKnob experience. Under active development.
+
+### SmartKnob Handheld
+An exploration of a small handheld form-factor. Under active development.
+
+### SmartKnob Mini
+Planned for the future.
+
+## Component Info
+
+### Magnetic encoders
+#### TLV493 (Infineon)
+A decent choice, and easy to prototype with using [Adafruit's QWIIC breakout board](https://www.adafruit.com/product/4366).
+
+In my testing, it is a little noisy, requiring filtering/smoothing that can slow responsiveness, hurting control loop stability. Or, with less filtering, the noise
+can easily be "amplified" by the derivative component in the PID motor torque controller, causing audible (and tactile) humming/buzzing.
+
+As of 2022-02-08, there is limited availability of this IC.
+
+[Datasheet](https://www.mouser.com/datasheet/2/196/Infineon_TLV493D_A1B6_DataSheet_v01_10_EN-1227967.pdf)
+
+#### MT6701 (MagnTek)
+Very promising based on the datasheet and initial prototyping.
+
+ - Haven't testing in a full control loop yet, but data looks good and relatively noise-free.
+ - Lots of IO options - SPI, I2C, and ABZ - should offer good response latency.
+ - No power-down or low-power options - may not be ideal for battery-powered devices
+ - Not available from US distributors (Mouser, Digi-Key)
+
+[Datasheet](http://www.magntek.com.cn/upload/MT6701_Rev.1.5.pdf)
+
+[Ordering (LCSC)](https://lcsc.com/product-detail/Angle-Linear-Position-Sensors_Magn-Tek-MT6701CT-STD_C2856764.html)
+
+### Motor drivers
+#### TMC6300-LA
+This is a relatively new IC and it's a perfect match! There generally aren't any other drivers (with integrated fets) that meet the requirements for the low-voltage and low-current motors used in this project.
+
+Highlights:
+ - 2-11V DC motor supply input
+ - Up to 1.2A RMS
+ - Tiny (3x3mm QFN)
+
+ [Datasheet](https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC6300_datasheet_rev1.07.pdf)
+
+ [Product page](https://www.trinamic.com/products/integrated-circuits/details/tmc6300-la/)
+
+### Motors
+TODO
+
+# Firmware
+TODO
+
+# License
+
+This project is licensed under Apache v2 (see [LICENSE.txt](LICENSE.txt)).
+
+    Copyright 2022 Scott Bezek
+    
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+    
+        http://www.apache.org/licenses/LICENSE-2.0
+    
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+