improve readme and add changelog

CHANGELOG.md

@@ -0,0 +1,7 @@
+#Change Log
+
+## 0.1.1 (2019-08-17)
+Add this change log and improve README.md
+
+## 0.1.0 (2019-08-17)
+Initial implementation of plugin.

README.md

@@ -79,3 +79,18 @@ module.exports = {
   }
 }
 ```
+
+### Adding Math Equations to your markdown files
+
+To insert a math expression in your text, put your katex math expression in $, e.g.
+```markdown
+The example for an inline math expression is $ (a+b)^2 = a^2 + 2ab + b^2 $. 
+```
+
+To insert a math expression on its own line horizontally centerd, put your katex math expression in $$ with line breaks, e.g.
+```markdown
+The example for a math expression:
+$$
+(a+b)^2 = a^2 + 2ab + b^2
+$$ 
+```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gridsome-remark-katex",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "Gridsome remark support for math equations using remark-math and katex",
   "main": "index.js",
   "repository": {