Add README

android/README.md

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+# Uonet+ request signer for android
+
+[![](https://jitpack.io/v/wulkanowy/uonet-request-signer.svg)](https://jitpack.io/#wulkanowy/uonet-request-signer)
+
+## Instalation
+
+```grovy
+allprojects {
+    repositories {
+        maven { url 'https://jitpack.io' }
+    }
+}
+
+dependencies {
+    implementation 'com.github.wulkanowy:uonet-request-signer:android:master-SNAPSHOT'
+}
+```
+
+## Usage
+
+```kotlin
+import io.github.wulkanowy.signer.android.signContent
+
+val signed = signContent(password, certificate, content)
+```
+
+## Tests
+
+```bash
+$ ./gradlew test
+```