build: add release signing config + docs: privacy policy

Author: MarkADom

.gitignore

@@ -91,5 +91,11 @@ replay_pid*
 # Room schema exports should be committed for migration tracking
 !app/schemas/
 
+#DIRENV
+.envrc
+
 # Claude
-.claude
+.claude
+
+# Goolge Play Console
+noiseguard-release.jks

app/build.gradle.kts

@@ -19,9 +19,24 @@ android {
         testInstrumentationRunner = "com.marcodomingues.noiseguard.HiltTestRunner"
     }
 
+    signingConfigs {
+        create("release") {
+            storeFile = file("../noiseguard-release.jks")
+            storePassword = System.getenv("KEYSTORE_PASSWORD") ?: ""
+            keyAlias = "noiseguard"
+            keyPassword = System.getenv("KEY_PASSWORD") ?: ""
+        }
+    }
+
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
+            isShrinkResources = true
+            signingConfig = signingConfigs.getByName("release")
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }
 

docs/index.md

@@ -0,0 +1,8 @@
+# NoiseGuard
+
+Real-time ambient noise monitoring for Android.
+
+---
+
+- [Privacy Policy](privacy-policy)
+- [GitHub Repository](https://github.com/MarkADom/NoiseGuard)

docs/privacy-policy.md

@@ -0,0 +1,44 @@
+# NoiseGuard — Privacy Policy
+
+*Last updated: May 2026*
+
+---
+
+## English
+
+### What NoiseGuard does
+NoiseGuard measures ambient noise levels in real time using your device's microphone. That's it.
+
+### What data we collect
+**Nothing that leaves your device.**
+
+- **Noise readings** (decibel levels + timestamps) are stored locally in a database on your device.
+- **No audio is ever recorded.** The microphone is used only to calculate a noise level number. Raw audio is processed in memory and immediately discarded.
+- **No personal data** is collected — no name, no email, no location, no device identifiers.
+- **No analytics, no crash reporting, no advertising SDKs.**
+
+### How data is stored
+All data stays on your device. NoiseGuard has no servers, no cloud storage, and no internet connection. Your noise history never leaves your phone.
+
+### How to delete your data
+Open NoiseGuard → Settings → Clear History. This permanently deletes all stored readings from your device.
+
+Uninstalling the app also removes all data.
+
+### Permissions
+- **Microphone (RECORD_AUDIO)** — required to measure noise levels. Without this permission the app cannot function.
+- **Notifications (POST_NOTIFICATIONS)** — optional. Used only to alert you when noise exceeds your configured threshold.
+
+### Third parties
+NoiseGuard does not share any data with third parties. There are no third-party SDKs that collect data.
+
+### Children
+NoiseGuard does not knowingly collect data from children under 13. The app collects no personal data from anyone.
+
+### Changes
+If this policy changes, the updated version will be posted at this URL with a new date.
+
+### Contact
+Questions? Reach us at: marcodomingues.dev@gmail.com
+
+---