Added feature flagging document

docs/feature-flagging.md

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+# Feature Flagging
+
+## Using Environment Variables
+
+This guide explains how to update cloud foundry envirionment variables to enable or disable feature flagging.
+
+### Prerequisites
+
+- Cloud Foundry CLI (`cf`) must be installed.
+- Access to Cloud Foundry with the necessary credentials.
+
+## Steps to Update
+
+### 1. Log in to Cloud Foundry
+
+```bash
+cf login -a api.fr.cloud.gov --sso
+```
+
+### 2. Target Correct Space
+
+This should be handled after authenticating but if not, you can target the spaces specifically
+
+```
+cf target -o gsa-tts-benefits-studio -s notify-sandbox
+```
+
+### 3. Set Environment Variable
+
+```
+cf set-env <APP_NAME> <ENV_VAR_NAME> <VALUE>
+```
+
+#### Example:
+
+```
+cf set-env notify-admin-sandbox FEATURE_GUIDANCE_ENABLED true
+```
+
+### 4. Restage the Application
+
+```
+cf restage <APP_NAME>
+```
+
+#### Example:
+
+```
+cf restage notify-admin-sandbox
+```