Add README.md

Author: phenry20

README.md

@@ -0,0 +1,49 @@
+# C9S.Extensions.Configuration
+
+
+### Usage
+---
+
+This
+
+```json
+{
+    "General":
+    {
+        "HttpListenPort": "3000",
+        "HttpsListenPort": "3001",
+        "WebUrl": "https://localhost:{{General.HttpsListenPort}}"
+    },
+    "Pages":
+    {
+        "AuthorizeAddress": "{{General.WebUrl}}/api/beta/authorize",
+        "DashboardAddress": "{{General.WebUrl}}/dashboard"
+    }
+}
+```
+
+Becomes
+
+```json
+{
+    "General":
+    {
+        "HttpsListenPort": "3001",
+        "WebUrl": "https://localhost:3001"
+    },
+    "Pages":
+    {
+        "AuthorizeAddress": "https://localhost:3001/api/beta/authorize",
+        "DashboardAddress": "https://localhost:3001/dashboard"
+    }
+}
+```
+
+After running
+
+```cs
+IConfigurationRoot configuration = ...
+configuration.ResolveVariables();
+```
+
+ResolveVariables will take any variable path and resolve it. It even works across .json files. As long as the data is stored inside the ConfigurationRoot, it is resolvable