add: example and Readme

examples/build.gradle.kts

@@ -44,6 +44,9 @@ dependencies {
     implementation("org.slf4j:slf4j-simple:1.7.30")
     // plotting
     implementation("space.kscience:plotlykt-server:0.4.0-dev-2")
+
+    //jafama
+    implementation(project(":kmath-jafama"))
 }
 
 kotlin.sourceSets.all {

examples/src/main/kotlin/space/kscience/kmath/jafama/KMathaJafamaDemo.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2018-2021 KMath contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package space.kscience.kmath.jafama
+
+import net.jafama.FastMath
+
+
+fun main(){
+    val a = JafamaDoubleField.number(2.0)
+    val b = StrictJafamaDoubleField.power(FastMath.E,a)
+
+    println(JafamaDoubleField.add(b,a))
+    println(StrictJafamaDoubleField.ln(b))
+}

kmath-jafama/README.md

@@ -0,0 +1,24 @@
+# Module kmath-jafama
+
+Jafama based implementation of DoubleField of kmath-operations.
+
+- JafamaDoubleField : DoubleField implementation using FastMath
+- StrictJafamaDoubleField - DoubleField implementation using StrictFastMath
+
+## Examples
+
+Different Operations on DoubleField
+
+```kotlin
+package space.kscience.kmath.jafama
+
+import net.jafama.FastMath
+
+
+fun main(){
+    val a = JafamaDoubleField.number(2.0)
+    val b = StrictJafamaDoubleField.power(FastMath.E,a)
+    println(JafamaDoubleField.add(b,a))
+    println(StrictJafamaDoubleField.ln(b))
+}
+```