add problem matchers

Author: flexatone

.github/problem-matchers/gcc.json

@@ -0,0 +1,18 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "gcc-problem-matcher",
+            "pattern": [
+                {
+                    "regexp": "^\\s*(.*):(\\d+):(\\d+):\\s+(?:fatal\\s+)?(warning|error):\\s+(.*?(?:\\s+\\[(.*)\\])?)\\s*$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "message": 5,
+                    "code": 6
+                }
+            ]
+        }
+    ]
+}

.github/problem-matchers/msvc.json

@@ -0,0 +1,18 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "msvc-problem-matcher",
+            "pattern": [
+                {
+                    "regexp": "^\\s*(?:\\d+\\>)?([^\\s].*)\\((\\d+),?(\\d+)?(?:,\\d+,\\d+)?\\)\\s*:\\s+(error|warning)\\s+((\\w+\\d+)\\s*:\\s*.*?)\\s*$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "message": 5,
+                    "code": 6
+                }
+            ]
+        }
+    ]
+}