Add development notes to readme

MacDown.xcworkspace/xcshareddata/MacDown.xccheckout

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDESourceControlProjectFavoriteDictionaryKey</key>
+	<false/>
+	<key>IDESourceControlProjectIdentifier</key>
+	<string>986767E6-9A53-42CD-BFAA-ABCFE07D0246</string>
+	<key>IDESourceControlProjectName</key>
+	<string>MacDown</string>
+	<key>IDESourceControlProjectOriginsDictionary</key>
+	<dict>
+		<key>69C569CB-1F6C-4CD2-B0B6-13C61B55C751</key>
+		<string>ssh://github.com/uranusjr/macdown.git</string>
+	</dict>
+	<key>IDESourceControlProjectPath</key>
+	<string>MacDown.xcworkspace</string>
+	<key>IDESourceControlProjectRelativeInstallPathDictionary</key>
+	<dict>
+		<key>69C569CB-1F6C-4CD2-B0B6-13C61B55C751</key>
+		<string>..</string>
+	</dict>
+	<key>IDESourceControlProjectURL</key>
+	<string>ssh://github.com/uranusjr/macdown.git</string>
+	<key>IDESourceControlProjectVersion</key>
+	<integer>110</integer>
+	<key>IDESourceControlProjectWCCIdentifier</key>
+	<string>69C569CB-1F6C-4CD2-B0B6-13C61B55C751</string>
+	<key>IDESourceControlProjectWCConfigurations</key>
+	<array>
+		<dict>
+			<key>IDESourceControlRepositoryExtensionIdentifierKey</key>
+			<string>public.vcs.git</string>
+			<key>IDESourceControlWCCIdentifierKey</key>
+			<string>69C569CB-1F6C-4CD2-B0B6-13C61B55C751</string>
+			<key>IDESourceControlWCCName</key>
+			<string>macdown</string>
+		</dict>
+	</array>
+</dict>
+</plist>

README.md

@@ -27,3 +27,13 @@ The following editor themes and CSS files are extracted from [Mou](http://mouapp
 * Clearness Dark
 * GitHub
 * GirHub2
+
+## Development
+
+If you wish to build MacDown yourself, you will need [Cocoapods](http://cocoapods.org). After you clone the repository, run the following command inside the repository root (directory containing the `Podfile` file):
+
+```bash
+pod install
+```
+
+and open `MacDown.xcworkspace` in Xcode. Refer to the official Cocoapods guide if you need more instructions on its installation, setup, and usage.