Add Network Adapter Configuration Tool and Presets Management

- Created NetworkAdapter.psm1 module for managing network adapters.
- Implemented functions for displaying adapter information, setting DHCP/manual configurations, and managing DNS settings.
- Added functionality to save and load network presets in JSON format.
- Introduced a schema for validating the presets structure.
- Added a .gitignore file to exclude local network presets from version control.
- Created a test-syntax.ps1 script to validate PowerShell syntax for the main script files.

network-presets.schema.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Network Presets Schema",
+  "type": "object",
+  "properties": {
+    "presets": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "adapterGuid": { "type": "string" },
+          "adapterName": { "type": "string" },
+          "adapterDescription": { "type": "string" },
+          "presets": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "properties": {
+                "name": { "type": "string" },
+                "type": { "type": "string", "enum": ["Manual","DHCP"] },
+                "ipAddress": { "type": "string" },
+                "prefixLength": { "type": "integer", "minimum": 0, "maximum": 32 },
+                "gateway": { "type": ["string","null"] },
+                "dns": { "type": "array", "items": { "type": "string" } }
+              },
+              "required": [ "name", "type" ]
+            }
+          }
+        },
+        "required": [ "adapterGuid", "presets" ]
+      }
+    }
+  },
+  "required": [ "presets" ]
+}