skill: add Android skills

.agents/skills/display-glasses-with-jetpack-compose-glimmer/references/button-samples-source.md

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+When creating a Glimmer Button component, refer to the following implementation
+samples in `ButtonSamples.kt`:
+
+
+```kotlin
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.xr.glimmer.samples
+
+import androidx.annotation.Sampled
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.wrapContentSize
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.xr.glimmer.Button
+import androidx.xr.glimmer.ButtonSize
+import androidx.xr.glimmer.GlimmerTheme
+import androidx.xr.glimmer.Icon
+import androidx.xr.glimmer.Text
+import androidx.xr.glimmer.list.GlimmerLazyColumn
+
+@Composable
+fun ButtonSampleUsage() {
+    GlimmerLazyColumn(
+        horizontalAlignment = Alignment.CenterHorizontally,
+        modifier = Modifier.fillMaxSize().wrapContentSize(Alignment.Center),
+    ) {
+        item { ButtonSample() }
+        item { ButtonWithLeadingIconSample() }
+        item { ButtonWithTrailingIconSample() }
+        item { ButtonWithLeadingAndTrailingIconSample() }
+        item { LargeButtonSample() }
+        item { LargeButtonWithLeadingIconSample() }
+        item { LargeButtonWithTrailingIconSample() }
+        item { LargeButtonWithLeadingAndTrailingIconSample() }
+    }
+}
+
+@Sampled
+@Composable
+fun ButtonSample() {
+    Button(onClick = {}) { Text("Send") }
+}
+
+@Sampled
+@Composable
+fun ButtonWithLeadingIconSample() {
+    Button(onClick = {}, leadingIcon = { Icon(FavoriteIcon, "Localized description") }) {
+        Text("Send")
+    }
+}
+
+@Composable
+private fun ButtonWithTrailingIconSample() {
+    Button(onClick = {}, trailingIcon = { Icon(FavoriteIcon, "Localized description") }) {
+        Text("Send")
+    }
+}
+
+@Composable
+private fun ButtonWithLeadingAndTrailingIconSample() {
+    Button(
+        onClick = {},
+        leadingIcon = { Icon(FavoriteIcon, "Localized description") },
+        trailingIcon = { Icon(FavoriteIcon, "Localized description") },
+    ) {
+        Text("Send")
+    }
+}
+
+@Sampled
+@Composable
+fun LargeButtonSample() {
+    Button(onClick = {}, buttonSize = ButtonSize.Large) { Text("Send") }
+}
+
+@Composable
+private fun LargeButtonWithLeadingIconSample() {
+    Button(
+        onClick = {},
+        buttonSize = ButtonSize.Large,
+        leadingIcon = { Icon(FavoriteIcon, "Localized description") },
+    ) {
+        Text("Send")
+    }
+}
+
+@Composable
+private fun LargeButtonWithTrailingIconSample() {
+    Button(
+        onClick = {},
+        buttonSize = ButtonSize.Large,
+        trailingIcon = { Icon(FavoriteIcon, "Localized description") },
+    ) {
+        Text("Send")
+    }
+}
+
+@Composable
+private fun LargeButtonWithLeadingAndTrailingIconSample() {
+    Button(
+        onClick = {},
+        buttonSize = ButtonSize.Large,
+        leadingIcon = { Icon(FavoriteIcon, "Localized description") },
+        trailingIcon = { Icon(FavoriteIcon, "Localized description") },
+    ) {
+        Text("Send")
+    }
+}
+
+@Preview
+@Composable
+private fun ButtonPreview() {
+    GlimmerTheme { ButtonSample() }
+}
+
+@Preview
+@Composable
+private fun ButtonWithLeadingIconPreview() {
+    GlimmerTheme { ButtonWithLeadingIconSample() }
+}
+
+@Preview
+@Composable
+private fun ButtonWithTrailingIconPreview() {
+    GlimmerTheme { ButtonWithTrailingIconSample() }
+}
+
+@Preview
+@Composable
+private fun ButtonWithLeadingAndTrailingIconPreview() {
+    GlimmerTheme { ButtonWithLeadingAndTrailingIconSample() }
+}
+
+@Preview
+@Composable
+private fun LargeButtonPreview() {
+    GlimmerTheme { LargeButtonSample() }
+}
+
+@Preview
+@Composable
+private fun LargeButtonWithLeadingIconPreview() {
+    GlimmerTheme { LargeButtonWithLeadingIconSample() }
+}
+
+@Preview
+@Composable
+private fun LargeButtonWithTrailingIconPreview() {
+    GlimmerTheme { LargeButtonWithTrailingIconSample() }
+}
+
+@Preview
+@Composable
+private fun LargeButtonWithLeadingAndTrailingIconPreview() {
+    GlimmerTheme { LargeButtonWithLeadingAndTrailingIconSample() }
+}
+```
+
+<br />