Kotlin: implemented Body enum with code docs.

Implemented the Body enum, with documentation strings
in comments. Reworked the Gradle build to generate
GitHub Flavored Markdown (gfm) instead of html.

generate/unit_test_kotlin

@@ -8,7 +8,7 @@ Fail()
 [[ "$1" == "" || "$1" == "-v" ]] || Fail "Invalid command line options."
 
 cd ../source/kotlin || Fail "Cannot change dir to ../source/kotlin"
-./gradlew assemble build test dokkaHtml || Fail "Error building/testing Kotlin code."
+./gradlew assemble build test dokkaGfm || Fail "Error building/testing Kotlin code."
 
 #for file in temp/kotlin_longitude_*.txt; do
 #    ./generate $1 check ${file} || Fail "Failed verification of file ${file}"

source/kotlin/src/main/kotlin/io/github/cosinekitty/astronomy/Main.kt

@@ -1,12 +1,107 @@
 package io.github.cosinekitty.astronomy
 
-fun add(a: Int, b: Int): Int = a + b
+/*
+    Astronomy Engine for Kotlin / JVM.
+    https://github.com/cosinekitty/astronomy
 
-class Accumulator {
-    var state = 0
-        private set
+    MIT License
 
-    fun accumulate(x: Int) {
-        state += x
-    }
-}
+    Copyright (c) 2019-2022 Don Cross <cosinekitty@gmail.com>
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+*/
+
+/**
+ * The enumeration of celestial bodies supported by Astronomy Engine.
+ */
+enum class Body
+{
+    /**
+     * A placeholder value representing an invalid or unknown celestial body.
+     */
+    Invalid,
+
+    /**
+     * The planet Mercury.
+     */
+    Mercury,
+
+    /**
+     * The planet Venus.
+     */
+    Venus,
+
+    /**
+     * The planet Earth.
+     * Some functions that accept a `Body` parameter will fail if passed this value
+     * because they assume that an observation is being made from the Earth,
+     * and therefore the Earth is not a target of observation.
+     */
+    Earth,
+
+    /**
+     * The planet Mars.
+     */
+    Mars,
+
+    /**
+     * The planet Jupiter.
+     */
+    Jupiter,
+
+    /**
+     * The planet Saturn.
+     */
+    Saturn,
+
+    /**
+     * The planet Uranus.
+     */
+    Uranus,
+
+    /**
+     * The planet Neptune.
+     */
+    Neptune,
+
+    /**
+     * The planet Pluto.
+     */
+    Pluto,
+
+    /**
+     * The Sun.
+     */
+    Sun,
+
+    /**
+     * The Earth's natural satellite, the Moon.
+     */
+    Moon,
+
+    /**
+     * The Earth/Moon Barycenter.
+     */
+    EMB,
+
+    /**
+     * The Solar System Barycenter.
+     */
+    SSB,
+};

source/kotlin/src/test/kotlin/io/github/cosinekitty/astronomy/Tests.kt

@@ -6,6 +6,9 @@ import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.CsvSource
 
 class Tests {
+
+
+    /*
     @Test
     fun `tests accumulator`() {
         val accumulator = Accumulator()
@@ -24,5 +27,6 @@ class Tests {
     fun `tests addition`(a: Int, b: Int, result: Int) {
         assertEquals(result, add(a, b))
     }
+    */
 }