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 <h1 id="welcome-to-rjq">Welcome to rjq</h1>
-<!-- For full documentation visit [mkdocs.org](https://www.mkdocs.org). -->
-
+<p><code>rjq</code> is a simple and lightweight CLI JSON filtering tool designed for Windows and Linux.</p>
 <h2 id="flags">Flags</h2>
 <ul>
 <li><code>--load</code> - Loads JSON data from file.</li>
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+# Welcome to rjq
+
+`rjq` is a simple and lightweight CLI JSON filtering tool designed for Windows and Linux.
+
+## Flags
+
+- `--load` - Loads JSON data from file.
+- `--query` - Query to be performed on the dataset.
+- `--params` - Selects specific fields that will be returned as result.
+
+## Commands
+
+* `rjq --load="<file name>"` - Loads JSON data from file and returns all the data as result.
+* `rjq --query="<query string>"` - Sets query string.
+* `rjq --params="<comma separated field names>"` - Sets fileds for the result
+
+## Usage
+
+* `rjq --load="test.json" --query="<query string>" --params="<comma separated field names>"` - Loads data from file, applies the query, returns array of objects with fields specified by '--params' flag.
+* `stto --json cpython | rjq --query="<query string>" --params="<comma separated field names>"` - Piping output from other program.
+
+    ***N.B.** [stto](https://github.com/mainak55512/stto) is a line of code counter used as an example here.*
+
+## Query structure
+
+Query is set by `--query` flag, e.g. `--query="age > 30 && percentage >= 50.0"`.
+rjq has a simple query structure, it follows `[field_name] [operator] [Value]` pattern.
+
+- `field_name` - It is the field name from the supplied dataset. For nested objects '.' operator should be used for accessing values, e.g.
+    to access 'town' value from the following json:
+
+    ```
+  {
+    "_id": "88L33FM4VQBB1QYH",
+    "address": {
+      "postode": "CR45 9NE",
+      "street": "3137 Stich Avenue",
+      "town": "Swanley"
+    }
+  }
+    ```
+
+    use `address.town` in the field_name of the query.
+
+    ***N.B.** `field_name` should not be wrapped in any quotes.*
+
+- `Operator` - The following operators are supported for now:
+    * `=` - `equal_to` operator, checks if both sides are same.
+    * `!=` - `not_equals` operator, checks if both sides are NOT same.
+    * `>` - `greather_than` operator, checks if `left` is greater than to `right`.
+    * `<` - `less_than` operator, checks if `left` is lesser than to `right`.
+    * `>=` - `greather_than_or_equal` operator, checks if `left` is greater than to `right` or same.
+    * `<=` - `less_than_or_equal` operator, checks if `left` is lesser than to `right` or same.
+    * `&&` - `and` operator, joins two Binary expressions, e.g. `age > 18 && percentage < 34.0`.
+    * `||` - `or` operator, joins two Binary expressions, e.g. `age > 18 || percentage < 34.0`.
+- `Value` - rjq supports 3 types of values, `string`, `boolean` & `number`.
+    * `String` - strings should be wrapped in single quotes (') only, e.g. `'name'`, `'address'` etc.
+    * `Boolean` - `true`/`false` without any quotes.
+    * `Number` - Any number without quotes. For comparing decimal numbers decimal point should be provided, e.g. for quering `age` & `percentage` of the following - 
+    ```
+    {
+    "age": 30,
+    ...
+    "percentage": 56.34,
+    ...
+    }
+    ```
+    use something like `age > 18 && percentage > 50.0`.
+
+## Parameters
+
+Output parameters are set by `--params` flag e.g. `--params="name, address.town"`.
+Dot walking is supported for nested object fields.
+
+## Project layout
+
+    src/
+        main.rs         # Entry point for the program.
+        lexer.rs        # Lexer of the program, tokenizes the query string.
+        parser.rs       # Parser of the program, creates Abstract syntax tree from the tokens generated by the lexer.
+        interpreter.rs  # Interprets the AST and returns boolean value after evaluating the query.
+        helper.rs       # Utility file.
+    
+    Cargo.toml          # Configuration file for the project.
+    
+    LICENSE             # License file.
+    
+    README.md           # Readme file.
diff --git a/docs/search/search_index.json b/docs/search/search_index.json
index a36de4f..91f51e9 100644
--- a/docs/search/search_index.json
+++ b/docs/search/search_index.json
@@ -1 +1 @@
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\ No newline at end of file
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