markdown: add wysiwyg editor drawables(taken from OctoDroid)

app/src/main/res/drawable/md_bold.xml

@@ -0,0 +1,10 @@
+<!-- drawable/format_bold.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+        android:fillColor="#000"
+        android:pathData="M13.5,15.5H10V12.5H13.5A1.5,1.5 0 0,1 15,14A1.5,1.5 0 0,1 13.5,15.5M10,6.5H13A1.5,1.5 0 0,1 14.5,8A1.5,1.5 0 0,1 13,9.5H10M15.6,10.79C16.57,10.11 17.25,9 17.25,8C17.25,5.74 15.5,4 13.25,4H7V18H14.04C16.14,18 17.75,16.3 17.75,14.21C17.75,12.69 16.89,11.39 15.6,10.79Z" />
+</vector>

app/src/main/res/drawable/md_code.xml

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+<!-- drawable/code_tags.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+		android:fillColor="#000"
+        android:pathData="M14.6,16.6L19.2,12L14.6,7.4L16,6L22,12L16,18L14.6,16.6M9.4,16.6L4.8,12L9.4,7.4L8,6L2,12L8,18L9.4,16.6Z" />
+</vector>

app/src/main/res/drawable/md_italic.xml

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+<!-- drawable/format_italic.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+		android:fillColor="#000"
+        android:pathData="M10,4V7H12.21L8.79,15H6V18H14V15H11.79L15.21,7H18V4H10Z" />
+</vector>

app/src/main/res/drawable/md_link.xml

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+<!-- drawable/link.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+		android:fillColor="#000"
+        android:pathData="M16,6H13V7.9H16C18.26,7.9 20.1,9.73 20.1,12A4.1,4.1 0 0,1 16,16.1H13V18H16A6,6 0 0,0 22,12C22,8.68 19.31,6 16,6M3.9,12C3.9,9.73 5.74,7.9 8,7.9H11V6H8A6,6 0 0,0 2,12A6,6 0 0,0 8,18H11V16.1H8C5.74,16.1 3.9,14.26 3.9,12M8,13H16V11H8V13Z" />
+</vector>

app/src/main/res/drawable/md_strikethrough.xml

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+<!-- drawable/format_strikethrough.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+		android:fillColor="#000"
+        android:pathData="M3,14H21V12H3M5,4V7H10V10H14V7H19V4M10,19H14V16H10V19Z" />
+</vector>