Adding docs into core repo again

docs/breakingChanges.md

@@ -0,0 +1,51 @@
+# Breaking changes
+
+### Breaking changes from history version to latest version:
+
+## #1
+
+```javascript
+mermaid.initialize({
+    sequenceDiagram:{
+        ...
+    }
+})
+```
+
+has been changed to
+
+```javascript
+mermaid.initialize({
+    sequence:{
+        ...
+    }
+})
+```
+
+## #2
+
+In old versions you need to add CSS file to your HTML:
+
+```html
+<link rel="stylesheet" href="mermaid.min.css">
+```
+
+or
+
+```html
+<link rel="stylesheet" href="mermaid.forest.min.css">
+```
+
+Now it is not needed to do so. And there are no more CSS files in distrubtion files.
+
+You just
+
+```javascript
+mermaid.initialize({
+    theme: 'forest'
+})
+```
+
+and it works like a charm.
+
+This is because now the CSS is inline with SVG for portability.