Update README.md

README.md

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 # easi
 
-easi is a library for the Easy Initialization of model parameters in three (or less) dimensional domains.
-The library is designed for use in grid-based simulation software, such as [SeisSol](https://github.com/SeisSol/SeisSol).
-
-The main idea is to describe a parameter model as a tree, where each inner node of the tree may have one
-of the following purposes:
-
-| Node type     | Purpose |
-| ------------- | ------- |
-| filter        | Accept only points with certain properties. |
-| map           | Map m-dimensional points to n-dimensional points. |
-
-Each node has labeled input dimensions and labeled output dimensions. E.g. a map might take x,y,z as input and return ρ, μ, and λ. When arriving at the leaf of the tree, the requested dimensions are set according to the provided dimensions. E.g. if an application ask for ρ and μ, these values are set according to the map.
-A map might also be just used for intermediate computation. E.g. assume a map computes ρ, μ, and λ from the spatial dimensions x, y, and z. This map may have children which compute Qp and Qs but depending on ρ, μ, and λ.
-
-## Dependencies and build instructions
-easi itself is a header-only library. (Only unit tests must be compiled with CMake.) It depends on
-
-* [ImpalaJIT](https://github.com/Manuel1605/ImpalaJIT)
-* [yaml-cpp](https://github.com/jbeder/yaml-cpp)
-
-Make sure to link against these libraries when using easi.
-
-easi requires C++11.
+easi is a library for the **E**asy **I**nitialization of models in three (or less or more) dimensional domains.
+The purpose of easi is to evaluate functions f : R^m -> R^n,
+which are described in a [YAML](http://yaml.org) configuration file.
+In grid-based simulation software, such as [SeisSol](http://www.seissol.org>),
+easi may be used to define models.
+In SeisSol, the function f maps every point in space (say x,y,z) to a vector of parameters (e.g. ρ, μ, and λ),
+which define a rheological model.
+Here, over 5000 lines of model-specific Fortran code could be replaced with YAML files.
 
 ## Documentation
-The reference documentation can be found in the [wiki](https://github.com/SeisSol/easi/wiki).
-
-## Example
-easi is configured via [YAML](http://yaml.org) configuration files. For example, such a configuration file
-could look like the following:
-```YAML
-!Any
-components:
-  - !AxisAlignedCuboidalDomainFilter
-    limits:
-      x: [-100000, 100000]
-      y: [-5000, 5000]
-      z: [-100000, 10000]
-    components:
-      - !ConstantMap
-        map:
-          lambda: 1e10
-          mu: 2e10
-          rho: 5000
-  - !LayeredModel
-    map: !AffineMap
-      matrix:
-        z: [0, 0, 1]
-      translation:
-        z: 0
-    interpolation: linear
-    parameters: [rho, mu, lambda]
-    nodes:
-      -100.0:   [2300.0, 0.1766e10, 0.4999e10]
-      -300.0:   [2300.0, 0.6936e10, 1.3872e10]
-      -1000.0:  [2600.0, 1.3717e10, 1.8962e10]
-      -3000.0:  [2700.0, 2.1168e10, 2.7891e10]
-      -6000.0:  [2870.0, 3.1041e10, 3.8591e10]
-      -31000.0: [3500.0, 3.9847e10, 4.3525e10]
-      -50000.0: [3200.0, 6.4800e10, 6.5088e10] 
-```
-Here, all points with y-coordinate inbetween -5 km and +5 km would be assigned constant model parameters.
-For all other points, a linear interpolation, depending on the z-coordinate is used.
-
-In order to use this model inside an application, the following code is sufficient:
-
-```c++
-#include <iostream>
-#include "easi/YAMLParser.h"
-#include "easi/ResultAdapter.h"
-
-struct ElasticMaterial {
-  double lambda, mu, rho;
-};
-
-int main(int argc, char** argv)
-{
-  easi::Query query(2,3);
-  query.x(0,0) = 1.0;
-  query.x(0,1) = 2.0;
-  query.x(0,2) = 3.0;
-  query.group(0) = 1;
-  query.x(1,0) = 2.0;
-  query.x(1,1) = 3.0;
-  query.x(1,2) = -4.0;
-  query.group(1) = 1;
-
-  easi::YAMLParser parser(3);
-  easi::Component* model = parser.parse("test.yaml");  
-
-  ElasticMaterial material[2];
-  easi::ArrayOfStructsAdapter<ElasticMaterial> adapter(material);
-  adapter.addBindingPoint("lambda", &ElasticMaterial::lambda);
-  adapter.addBindingPoint("mu",     &ElasticMaterial::mu);
-  adapter.addBindingPoint("rho",    &ElasticMaterial::rho);
-
-  model->evaluate(query, adapter);
-
-  delete model;
-
-  for (unsigned j = 0; j < 2; ++j) {
-    std::cout << material[j].lambda << " " << material[j].mu << " " << material[j].rho << std::endl;
-  }  
-
-  return 0;
-}
-
-```
+The reference documentation can be found on [Read the Docs](https://easyinit.readthedocs.io) or be downloaded as [PDF manual](http://readthedocs.org/projects/easyinit/downloads/pdf/latest/).