Add troubleshooting checklist

CHECK_THIS.md

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+# Space Configuration Checklist
+
+## In Hugging Face Space Settings:
+
+### 1. SDK Type
+- Go to Settings → General Settings
+- **SDK should be: `streamlit`** (NOT docker)
+- If it says "docker", change it to "streamlit" and save
+
+### 2. Main App File
+- Settings → General Settings
+- **App file should be: `app.py`**
+- (Leave blank for default, or set to `app.py`)
+
+### 3. Hardware
+- Settings → General Settings  
+- **Hardware**: CPU Basic (or upgrade if you have credits)
+
+### 4. Check Logs
+- Click on **"Logs"** tab (not the icon, the actual tab)
+- Look for any error messages
+- Screenshot and share any errors
+
+## Quick Fix to Try:
+
+1. Go to your Space: https://huggingface.co/spaces/Khamad/json-field-analyzer
+2. Click **Settings**
+3. Under **General Settings**:
+   - Make sure **SDK** = `streamlit`
+   - **App file** = `app.py` (or leave blank)
+4. Click **Save**
+5. Go back to your Space
+6. Click the **Refresh** button (circular arrow icon)
+
+## If Still Not Working:
+
+Share a screenshot of:
+- The Settings page
+- The Logs tab
+- The error message you see
+