add readme.md

Author: wuhaiyang

README.md

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+# FoldView#
+Expandable TextView With Smooth Transition Animation
+
+## Preview ##
+<img src="http://oce5ahwfo.bkt.clouddn.com/foldview.gif" />
+## How do Imp ？ ##
+* In Java
+```java
+        //create tmp textview to calculate TextView Height
+        StringBuilder sb = new StringBuilder();
+        //...
+        int width = getScreenWidth() - getMarginPlusPadding();
+        TextView tmpTextView = new TextView(getContext());
+        tmpTextView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mNormalSize);
+        SpannableString spannableString = hightLightAction(sb.toString());
+        tmpTextView.setText(spannableString);
+        tmpTextView.setPadding(getPaddingLeft(), getPaddingTop(), getPaddingRight(), getPaddingBottom());
+        tmpTextView.setLineSpacing(mRowSpace, 1);
+        TextPaint textPaint = tmpTextView.getPaint();
+        StaticLayout staticLayout = new StaticLayout(spannableString,textPaint,width,Layout.Alignment.ALIGN_NORMAL, 1, mRowSpace, false);
+        return staticLayout.getHeight();
+        // so StaticLayout can getHeight or getLineCount ....
+```
+
+## How Use ?
+   I Just Provide idea , Clone or download my project
+
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