add README.md, npmignore, and travis.yml

.npmignore

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+test
+coverage
+.travis.yml
+.mocharc.yml

.travis.yml

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+language: node_js
+sudo: false
+node_js:
+  - "10"
+  - "12"
+  - "node"
+
+before_script:
+  - "npm -g install npm@latest"
+
+script:
+  - "npm run cover"
+
+after_script:
+  - "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"

README.md

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+# EventCounter
+
+This is a JavaScript library that helps record (any kind of) incremental events, and query the number of events during the specific spantime.
+
+## Install
+
+```bash
+npm install event-counter
+```
+
+## Example
+
+```js
+const EventCounter = require('event-counter');
+
+const eventCounter = EventCounter();
+eventCounter.increment();
+eventCounter.increment();
+eventCounter.increment();
+
+// query the number of the events ocurred in last 1 sec
+eventCounter.query(1000);   // return 3
+
+// after 10 seconds ...
+eventCounter.increment();
+eventCounter.increment();
+
+// query the number of the events ocurred in last 1 sec
+eventCounter.query(1000);  // retrun 2
+```
+
+## Test
+
+```bash
+git clone https://github.com/zlargon/EventCounter.git
+
+# npm
+npm install
+npm test        # unit test
+npm run cover   # generate code coverage report to ./coverage/lcov-report/index.html
+```
+
+## Licence
+
+MIT

package.json

@@ -1,4 +1,13 @@
 {
+  "name": "event-counter",
+  "description": "Event Counter for node.js",
+  "version": "0.0.1",
+  "main": "index.js",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/zlargon/EventCounter.git"
+  },
   "devDependencies": {
     "chai": "^4.2.0",
     "coveralls": "^3.0.9",