add readme

README.md

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+# jsondb
+
+`jsondb` is a way to use JSON as a NoSQL database. It uses an ORM and is the only way to interact with the database.
+
+## Loading a database
+
+All you need to do is to use `loadDB`. Here is an example:
+
+```javascript
+let { loadDB } = require("jsondb");
+let db = loadDB("db.json");
+```
+
+## Setting values
+
+You do it just like any JavaScript object. Here is an example:
+
+```javascript
+db["bits"] = 64;
+db.bits = 64; // this also works
+```
+
+## Getting values
+
+Again, it's just like any JS object. Here is an example:
+
+```javascript
+let bits = db["bits"];
+bits = db.bits; // that also works
+```