Remove extensive README content; update Windows-specific installation instructions

Author: tisoz

README.md

@@ -4,3 +4,20 @@ https://www.npmjs.com/package/opencode-windows-fixed-cache
 ```
 npm i opencode-windows-fixed-cache
 ```
+
+
+`opencode.json` : enable `provider.options.enableMeta`
+
+
+```
+    "provider": {
+        "anthropic": {
+            "name": "fox.anthropic.claude",
+            "npm": "@ai-sdk/anthropic",
+            "options": {
+                "baseURL": "https://code.newcli.com/claude/aws/v1",
+                "apiKey": "sk-ant-oat01-x-xxx-xx",
+                "setCacheKey": true,
+                "enableMeta":true
+            },
+```