update detail steps in README

README.md

@@ -1,3 +1,57 @@
 # slackforce
 
 A Slack and Salesforce integration project written in Golang.
+
+## How to get Slack Token and Cookie
+
+TOKEN
++++++
+
+#. Open your browser's *Developer Console*.
+
+   #. In Firefox, under `Tools -> Browser Tools -> Web Developer tools` in the menu bar
+   #. In Chrome, click the 'three dots' button to the right of the URL Bar, then select
+      'More Tools -> Developer Tools'
+#. Switch to the console tab.
+#. Paste the following snippet and press ENTER to execute::
+
+     JSON.parse(localStorage.localConfig_v2).teams[document.location.pathname.match(/^\/client\/(T[A-Z0-9]+)/)[1]].token
+
+#. Token value is printed right after the executed command (it starts with
+   "``xoxc-``"), save it somewhere for now.
+
+COOKIE
+++++++
+
+**Getting the cookie value**
+
+#. Switch to Application_ tab and select **Cookies** in the left
+   navigation pane.
+#. Find the cookie with the name "``d``".  That's right, just the
+   letter "d".
+#. Double-click the Value of this cookie.
+#. Press Ctrl+C or Cmd+C to copy it's value to clipboard.
+#. Save it for later.
+
+Setting up the application
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+#. Create the file named ``.env``.
+#. Add the token and cookie values to it. End result
+   should look like this::
+
+     SLACK_TOKEN=xoxc-<...elided...>
+     SLACK_COOKIE=xoxd-<...elided...>
+
+   Alternatively, if you saved the cookies to the file, it will look like this::
+
+     SLACK_TOKEN=xoxc-<...elided...>
+     SLACK_COOKIE=path/to/slack.com_cookies.txt
+
+#. Save the file and close the editor.
+
+## Usage
+
+```
+make start
+```