add COBOL language support

lib/linguist/languages.yml

@@ -235,6 +235,15 @@ Clojure:
   filenames:
   - riemann.config
 
+COBOL:
+  type: programming
+  primary_extension: .cob
+  extensions:
+  - .cbl
+  - .cpy
+  - .cobol
+  - .ccp
+
 CoffeeScript:
   type: programming
   ace_mode: coffee

samples/COBOL/hello_world.cbl

@@ -0,0 +1,5 @@
+        program-id. hello.
+        procedure division.
+        display "Hello, World!".
+        stop run.
+

samples/COBOL/hello_world.ccp

@@ -0,0 +1,6 @@
+      IDENTIFICATION DIVISION.
+      PROGRAM-ID. hello.
+      PROCEDURE DIVISION.
+      DISPLAY "Hello World, yet again.".
+      STOP RUN.
+

samples/COBOL/hello_world.cob

@@ -0,0 +1,6 @@
+      IDENTIFICATION DIVISION.
+      PROGRAM-ID. hello.
+      PROCEDURE DIVISION.
+      DISPLAY "Hello World!".
+      STOP RUN.
+

samples/COBOL/simple.cpy

@@ -0,0 +1,7 @@
+01 COBOL-TEST-RECORD.
+  05 COBOL-TEST-USAGES.
+    10 COBOL-4-COMP PIC S9(4) COMP.
+    10 COBOL-8-COMP PIC S9(8) COMP.
+    10 COBOL-9-COMP PIC S9(9) COMP.
+    10 COBOL-4-COMP2 PIC S9(4) COMP-2.
+    10 COBOL-7-COMP2 PIC 9(7) COMP-2.