feat: Added C3 programming language. (#1319)

* Added C3 programming language

* Update c3.c3

* Corrected C3 test file.

README.md

@@ -320,6 +320,7 @@ Bitbake
 BQN
 BrightScript
 C
+C3
 Cabal
 Cassius
 Ceylon

languages.json

@@ -207,6 +207,12 @@
       "quotes": [["\\\"", "\\\""]],
       "extensions": ["c", "ec", "pgc"]
     },
+    "C3": {
+      "line_comment": ["//"],
+      "multi_line_comments": [["/*", "*/"]],
+      "quotes": [["\\\"", "\\\""]],
+      "extensions": ["c3"]
+    },
     "Cabal": {
       "nested": true,
       "line_comment": ["--"],

tests/data/c3.c3

@@ -0,0 +1,8 @@
+/* 8 lines 6 code 1 comments 1 blanks */
+
+fn int main() {
+    int x = 5; /* Multline line comment */
+    io::printn("Hello, world!");
+    int y = 4; // Single line comment.
+    return 0;
+}