Add .scd extension to SuperCollider.

lib/linguist/languages.yml

@@ -1143,6 +1143,8 @@ SuperCollider:
   color: "#46390b"
   lexer: Text only
   primary_extension: .sc
+  extensions:
+  - .scd
 
 Tcl:
   type: programming

samples/SuperCollider/example.scd

@@ -0,0 +1,51 @@
+// SuperCollider Examples
+
+//boot server
+s.boot;
+
+// SC as system for sound synthesis and sound processing
+
+
+// patching synth moduls by writing synth defs:
+
+(
+SynthDef("mod", {
+	var sig, resfreq;	
+	sig = Saw.ar(100);
+	resfreq = SinOsc.kr(2) * 200 + 500;
+	sig = RLPF.ar(sig, resfreq, 0.1);
+	sig = sig * 0.3;
+	Out.ar(0, sig);
+}).play;
+)	
+
+// SuperCollider: a powerful expressive DSP language:
+
+(
+30.do { arg i;  
+	{ Pan2.ar( 
+		SinOsc.ar(exprand(100.0, 3000.0) * LFNoise2.kr(rrand(0.1, 0.2)).range(0.95, 1.1), 0, 
+			LFNoise2.kr(rrand(0.3, 0.7)).range(0,0.5) ** 4), 
+		1.0.rand2) 
+	}.play 
+}
+)
+
+// plot envelopes
+a = Env.perc(0.05, 1, 1, -4);
+b = a.delay(2);
+a.test.plot;
+b.test.plot;
+
+a = Env([0.5, 1, 0], [1, 1]).plot;
+a.delay(1).plot;
+
+// examples asStream function
+(
+{
+e = Env.sine.asStream;
+5.do({
+    e.next.postln;
+    0.25.wait;
+})}.fork
+)