Add C, C++, C#

src/languages/c.js

@@ -0,0 +1,11 @@
+const Language = require('../struct/Language');
+
+class C extends Language {
+    constructor() {
+        super('c', {
+            aliases: ['c']
+        });
+    }
+}
+
+module.exports = C;

src/languages/cpp.js

@@ -0,0 +1,11 @@
+const Language = require('../struct/Language');
+
+class CPP extends Language {
+    constructor() {
+        super('cpp', {
+            aliases: ['cpp', 'c++']
+        });
+    }
+}
+
+module.exports = CPP;

src/languages/csharp.js

@@ -0,0 +1,22 @@
+const Language = require('../struct/Language');
+
+class CSharp extends Language {
+    constructor() {
+        super('csharp', {
+            aliases: ['csharp', 'cs'],
+            options: {
+                e: () => ''
+            }
+        });
+    }
+
+    runWith(options) {
+        if (options.has('e')) {
+            return { id: this.id, env: { EVAL_EXPR: 'true' } };
+        }
+
+        return super.runWith(options);
+    }
+}
+
+module.exports = CSharp;