Prompt addition of D

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+---
+language: d 
+filename: learnd.d 
+contributors:
+    - ["Nick Papanastasiou", "www.nickpapanastasiou.github.io"]
+lang: en
+---
+
+If you're like me and spend way to much time on the internet, odds are you've heard 
+about [D](http://dlang.org/). The D programming language is a modern, general-purpose,
+multi-paradigm language with fantastic support for OOP, functional programming, metaprogramming,
+and easy concurrency and parallelism, and runs the gamut from low-level features such as
+memory management, inline assembly, and pointer arithmetic, to high-level constructs 
+such as higher-order functions and generic structures and functions via templates, all with
+a pleasant syntax, and blazing fast performance! 
+
+D is actively developed by Walter Bright and Andrei Alexandrescu, two super smart, really cool
+dudes. With all that out of the way, let's look at some examples!
+
+'''d
+// You know what's coming...
+import std.stdio;
+
+// args is optional
+void main(string[] args) {
+    writeln("Hello, World!");
+}
+
+// Conditionals and loops work as expected.
+import std.stdio;
+
+void main() {
+    for(int i = 0; i < 5; i++) {
+        writeln(i);
+    }
+
+    auto n = 1; // use auto for type inferred variables
+
+    while(n < 10_000) {
+        n += n;
+    }
+
+    do {
+        n -= (n / 2);
+    } while(n > 0);
+
+    // For and while are nice, but in D-land we prefer foreach
+    foreach(i; 1..int.max) { // The .. creates a continuous range 
+        if(n % 2 == 0)
+            writeln(i);
+    }
+
+    foreach_reverse(i; short.max) {
+        if(n % 2 == 1)
+            writeln(i);
+        else
+            writeln("No!");
+    }
+}
+
+'''