skill: add Android skills

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

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+When creating a Glimmer Title Chip component, refer to the following
+implementation samples in `TitleChipSamples.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.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+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.Card
+import androidx.xr.glimmer.GlimmerTheme
+import androidx.xr.glimmer.Icon
+import androidx.xr.glimmer.Text
+import androidx.xr.glimmer.TitleChip
+import androidx.xr.glimmer.TitleChipDefaults
+import androidx.xr.glimmer.list.GlimmerLazyColumn
+
+@Composable
+fun TitleChipSampleUsage() {
+    GlimmerLazyColumn(
+        horizontalAlignment = Alignment.CenterHorizontally,
+        modifier = Modifier.fillMaxSize().wrapContentSize(Alignment.Center),
+    ) {
+        item { TitleChipSample() }
+        item { TitleChipWithLeadingIconSample() }
+        item { TitleChipWithCardSample() }
+    }
+}
+
+@Sampled
+@Composable
+fun TitleChipSample() {
+    TitleChip { Text("Messages") }
+}
+
+@Sampled
+@Composable
+fun TitleChipWithLeadingIconSample() {
+    TitleChip(leadingIcon = { Icon(FavoriteIcon, "Localized description") }) { Text("Messages") }
+}
+
+@Sampled
+@Composable
+fun TitleChipWithCardSample() {
+    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+        TitleChip { Text("Title Chip") }
+        Spacer(Modifier.height(TitleChipDefaults.associatedContentSpacing))
+        Card(
+            title = { Text("Title") },
+            subtitle = { Text("Subtitle") },
+            leadingIcon = { Icon(FavoriteIcon, "Localized description") },
+        ) {
+            Text("Card Content")
+        }
+    }
+}
+
+@Preview
+@Composable
+private fun TitleChipPreview() {
+    GlimmerTheme { TitleChipSample() }
+}
+
+@Preview
+@Composable
+private fun TitleChipWithLeadingIconPreview() {
+    GlimmerTheme { TitleChipWithLeadingIconSample() }
+}
+
+@Preview
+@Composable
+private fun TitleChipWithCardPreview() {
+    GlimmerTheme { TitleChipWithCardSample() }
+}
+```
+
+<br />