Add examples to document features

examples/database.effekt

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+import immutable/list
+
+interface DataBase[R] {
+    //will save name to database
+    def addEntry(entry: R): Unit
+
+    //returns list of currently saved names
+    def getEntries(): List[R]
+
+    //prints all names to console
+    def printEntries(): Unit
+}
+
+record Student(
+    firstName: String,
+    lastName: String,
+    id: Int
+)
+
+
+
+def myApplication(){ db: DataBase[Student] } = {
+    var currentId = 0;
+    def nextId():Int = {
+        val c = currentId;
+        currentId = currentId +1;
+        return c;
+    }
+    def newStudent(firstName: String, lastName: String): Student = {
+        Student(firstName, lastName, nextId());
+    }
+
+    db.addEntry(newStudent("Max","Marschall"));
+    db.addEntry(newStudent("Peter","Lustig"));
+    db.addEntry(newStudent("Pierre","Drole"));
+    db.addEntry(newStudent("Airan","Sayüt"));
+
+    db.printEntries[Student]()
+    println("db current state:")
+    println(db.getEntries[Student]())
+}
+
+def makeNewDB(){ r: Region }:DataBase[Student] at { r } = {
+    //create database instance
+    var names: List[Student] in r = [];
+    def firebase = new DataBase[Student] {
+
+        def addEntry(entry: Student) = {
+            names = Cons[Student](entry, names)
+        }
+
+        def getEntries() = {
+            return names;
+        }
+
+        def printEntries() = {
+            names.foreach(){ name => println(name); ()}
+        }
+    };
+    return firebase
+}
+
+def main() = {
+
+    //create database instance
+    var names: List[Student] = [];
+    var idCounter = 0;
+    def firebase = new DataBase[Student] {
+
+        def addEntry(entry: Student) = {
+            names = Cons[Student](entry, names)
+        }
+
+        def getEntries() = {
+            return names;
+        }
+
+        def printEntries() = {
+            names.foreach(){ name => println(name); ()}
+        }
+    };
+
+    region r {     
+        def fb2 = makeNewDB(){ r };
+        myApplication(){ fb2 }
+    }
+
+    //run application
+}

examples/timer.effekt

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+def main() = {
+    var time = currentTimeNanos();
+    var timeMillis = time / 1000000;
+    println("time millis: " ++ show(timeMillis))
+}