feat: support markdown syntax highlighting (#112)

* feat: support markdown syntax highlighting

Add's support for kusto syntax highlighting in markdown fenced
code blocks

Valid language names are kusto, kql, csl

Resolves: #93

* feat: add kusto logo to file

Add a dark mode variant with higher contrast

* fix: support csl fence block

kusto-syntax-highlighting/package.json

@@ -41,14 +41,28 @@
           ".kusto",
           ".kql"
         ],
-        "configuration": "./language-configuration.json"
+        "configuration": "./language-configuration.json",
+        "icon": {
+          "light": "./images/kusto_logo.png",
+          "dark": "./images/kusto_logo_dark.png"
+        }
       }
     ],
     "grammars": [
       {
         "language": "kusto",
         "scopeName": "source.kusto",
         "path": "./syntaxes/kusto.tmLanguage.json"
+      },
+      {
+        "scopeName": "markdown.kusto.codeblock",
+        "path": "./syntaxes/kusto-markdown-codeblock.json",
+        "injectTo": [
+          "text.html.markdown"
+        ],
+        "embeddedLanguages": {
+          "meta.embedded.block.kusto": "kusto"
+        }
       }
     ]
   },

kusto-syntax-highlighting/syntaxes/kusto-markdown-codeblock.json

@@ -0,0 +1,45 @@
+{
+  "fileTypes": [],
+  "injectionSelector": "L:text.html.markdown",
+  "patterns": [
+    {
+      "include": "#fenced_code_block_kusto"
+    }
+  ],
+  "repository": {
+    "fenced_code_block_kusto": {
+      "name": "markup.fenced_code.block.markdown",
+      "begin": "(^|\\G)(\\s*)(\\`{3,}|~{3,})\\s*(?i:(kusto|kql|csl)(\\s+[^`~]*)?$)",
+      "end": "(^|\\G)(?=\\s*[`~]{3,}\\s*$)",
+      "beginCaptures": {
+        "3": {
+          "name": "punctuation.definition.markdown"
+        },
+        "4": {
+          "name": "fenced_code.block.language.markdown"
+        },
+        "5": {
+          "name": "fenced_code.block.language.attributes.markdown"
+        }
+      },
+      "endCaptures": {
+        "3": {
+          "name": "punctuation.definition.markdown"
+        }
+      },
+      "patterns": [
+        {
+          "begin": "(^|\\G)(\\s*)(.*)",
+          "while": "(^|\\G)(?!\\s*([`~]{3,})\\s*$)",
+          "contentName": "meta.embedded.block.kusto",
+          "patterns": [
+            {
+              "include": "source.kusto"
+            }
+          ]
+        }
+      ]
+    }
+  },
+  "scopeName": "markdown.kusto.codeblock"
+}