added HtmlElement class

samples/HelloElement/README.md

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+![alt text](https://github.com/Catcrafts/Crafter.Web/blob/master/samples/HelloWorld/HelloWorld.png?raw=true)
+
+This sample demonstrates the use of the ``HtmlElement`` class.
+
+Run ``crafter-webbuild serve -c debug`` and go to ``localhost:8080`` to view it.

samples/HelloElement/main.cpp

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+import Crafter.CppDOM;
+using namespace Crafter::CppDOM;
+
+int main(){
+    HtmlElement body("body");
+    body.SetInnerHTML("Hello World!");
+    //No need to call FreeJs, this is done in the destructor of HtmlElement.
+}

samples/HelloElement/project.json

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+{
+    "name": "hello-element",
+    "configurations": [
+        {
+            "name": "debug",
+            "standard": "c++26",
+            "source_files": ["main"],
+            "module_files": [],
+            "additional_files": [],
+            "build_dir": "./build",
+            "output_dir": "./bin",
+            "optimization_level": "0",
+            "target": "wasm32-unknown-wasi",
+            "type": "executable",
+            "dependencies": [
+                {
+                    "path":"../../project.json",
+                    "configuration":"debug"
+                }
+            ]
+        }
+    ]
+}