skill: add Android skills

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

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+When creating a Glimmer Icon component, refer to the following source code in
+`IconSizes.kt` for setting icon sizes:
+
+
+```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
+
+import androidx.compose.runtime.Immutable
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+
+/**
+ * A set of named icon sizes.
+ *
+ * Sizes can be provided using [LocalIconSize] to set the size for [Icon]s within a component, or
+ * they can be set explicitly using [androidx.compose.foundation.layout.size].
+ *
+ * @property small the size of a small icon.
+ * @property medium the size of a medium icon. This is the default icon size.
+ * @property large the size of a large icon.
+ * @see Icon
+ * @see LocalIconSize
+ */
+@Immutable
+public class IconSizes(
+    public val small: Dp = 32.dp,
+    public val medium: Dp = 40.dp,
+    public val large: Dp = 48.dp,
+) {
+
+    /** Returns a copy of this IconSizes, optionally overriding some of the values. */
+    public fun copy(
+        small: Dp = this.small,
+        medium: Dp = this.medium,
+        large: Dp = this.large,
+    ): IconSizes = IconSizes(small = small, medium = medium, large = large)
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is IconSizes) return false
+
+        if (small != other.small) return false
+        if (medium != other.medium) return false
+        if (large != other.large) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = small.hashCode()
+        result = 31 * result + medium.hashCode()
+        result = 31 * result + large.hashCode()
+        return result
+    }
+
+    override fun toString(): String {
+        return "IconSizes(small=$small, medium=$medium, large=$large)"
+    }
+}
+```
+
+<br />