Merge pull request #67 from DrunkenLord/master

Other simple programs on Language D and a instruction file.

D/Instructions

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+To run your program in D you should do the following things: -
+1. Download the D compiler form the internet 
+2. Run the program as follows.
+
+On windows: -
+Now we can build and run a d file say helloWorld.d by switching to folder containing the file using cd and then using the following steps −
+
+C:\DProgramming> DMD helloWorld.d 
+C:\DProgramming> helloWorld
+We can see the following output.
+
+hello world
+
+
+On ubuntu: -
+Now we can build and run a d file say helloWorld.d by switching to folder containing the file using cd and then using the following steps −
+
+$ dmd helloWorld.d 
+$ ./helloWorld
+We can see the following output.
+
+$ hello world 
+
+
+On Mac OS X: -
+Similar to ubuntu.
+
+
+3.

D/Strings.d

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+import std.stdio;  
+
+/* My first program in D */ 
+void main(string[] args) { 
+   writeln("test!"); 
+}

D/Variables.d

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+import std.stdio; 
+
+int a = 10, b = 10; 
+int c;
+float f;  
+
+int main () { 
+   writeln("Value of a is : ", a); 
+
+   /* variable re definition: */ 
+   int a, b; 
+   int c; 
+   float f;
+
+   /* Initialization */ 
+   a = 30; 
+   b = 40; 
+   writeln("Value of a is : ", a); 
+
+   c = a + b; 
+   writeln("Value of c is : ", c);  
+
+   f = 70.0/3.0; 
+   writeln("Value of f is : ", f); 
+   return 0; 
+}

D/loops.d

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+mport std.stdio;
+
+int main () {
+
+   for( ; ; ) {
+      writefln("This loop will run forever.");
+   }
+   return 0;
+}