update readme and add repo to package.json

Author: njbotkin

package.json

@@ -1,7 +1,11 @@
 {
   "name": "splitdiff",
-  "version": "1.0.0",
+  "version": "0.1.0",
   "description": "Pretty line-level side-by-side (split) diffs in the terminal",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/njbotkin/splitdiff"
+  },
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"

readme.md

@@ -2,4 +2,15 @@
 
 Pretty split (side-by-side) diffs in your terminal!
 
-Can be used via CLI or API.  You can pipe git diffs into it like so: `git --no-pager diff HEAD~2 HEAD~1 | splitdiff`, or use it like `splitdiff a b`
+##install
+
+`npm i splitdiff`
+
+##usage
+
+Can be used via CLI or API.  Two different patterns: 
+
+- `git --no-pager diff HEAD~2 HEAD~1 | splitdiff`
+- `splitdiff a b`
+
+git diffs generally produce better results than the [built-in diff implementation](https://www.npmjs.com/package/diff).