Add project goals

Author: ufechner7

README.md

@@ -10,6 +10,23 @@ Discrete controllers for Winches.
 This package is part of Julia Kite Power Tools, which consists of the following packages:
 <p align="center"><img src="./docs/kite_power_tools.png" width="500" /></p>
 
+## Goals of this package
+The goal of this package is to provide controllers for winches that consist of a motor/generator connected to a drum (with or without gearbox). On the drum is a tether that is connected to a load or a kite. Currently operation in air is assumed, but the package could also be extended for winches connected to under-water cables. While the main use case of the author are airborne wind energy systems, I am open to add features needed for other use cases.
+
+**Implemented features:**
+- lower force control (assure that there is always a minimal cable tension)
+- upper force control (keep the maximal force limited)
+- reel-out speed control proportional to the square root of the force (other relationships can easily be added)
+- control of asynchronous motors/ generators
+- speed control
+
+**Planned features**
+- support of torque controlled winches
+- length control (position control)
+- integration of a quasi-steady tether model
+- auto-tuning of the controller
+
+
 ## Installation
 <details>
   <summary>Installation of Julia</summary>

docs/src/index.md

@@ -9,6 +9,22 @@ This package is part of Julia Kite Power Tools, which consist of the following p
 
 ![Julia Kite Power Tools](kite_power_tools.png)
 
+## Goals of this package
+The goal of this package is to provide controllers for winches that consist of a motor/generator connected to a drum (with or without gearbox). On the drum is a tether that is connected to a load or a kite. Currently operation in air is assumed, but the package could also be extended for winches connected to under-water cables. While the main use case of the author are airborne wind energy systems, I am open to add features needed for other use cases.
+
+**Implemented features:**
+- lower force control (assure that there is always a minimal cable tension)
+- upper force control (keep the maximal force limited)
+- reel-out speed control proportional to the square root of the force (other relationships can easily be added)
+- control of asynchronous motors/ generators
+- speed control
+
+**Planned features**
+- support of torque controlled winches
+- length control (position control)
+- integration of a quasi-steady tether model
+- auto-tuning of the controller
+
 ## Installation
 Install [Julia 1.10](https://ufechner7.github.io/2024/08/09/installing-julia-with-juliaup.html) or later, if you haven't already. On Linux, make sure that Python3 and Matplotlib are installed:
 ```