Add README to ext-latex module

markwon-ext-latex/README.md

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+# LaTeX
+
+This is a small extension that will help you display LaTeX formulas in your markdown.
+Syntax is pretty simple: pre-fix and post-fix your latex with `$$` (double dollar sign).
+`$$` should be the first characters in a line.
+
+```markdown
+$$
+\\text{A long division \\longdiv{12345}{13}
+$$
+```
+
+```markdown
+$$\\text{A long division \\longdiv{12345}{13}$$
+```
+
+```java
+Markwon.builder(context)
+    .use(CorePlugin.create())
+    .use(ImagesPlugin.create(context))
+    .use(JLatexMathPlugin.create(new Config(textSize))
+    .build();
+```
+
+This extension uses [jlatexmath-android](https://github.com/noties/jlatexmath-android) artifact to create LaTeX drawable. Then it
+registers special `latex` image scheme handler and uses `AsyncDrawableLoader` to display
+final result
+
+## Config
+
+```java
+public static class Config {
+
+    protected final float textSize;
+
+    protected Drawable background;
+
+    @JLatexMathDrawable.Align
+    protected int align = JLatexMathDrawable.ALIGN_CENTER;
+
+    protected boolean fitCanvas = true;
+
+    protected int padding;
+}
+```
+