CAL-57: Deploy library on Cocoapods

feat:
- Prepared library for cocoapods deploying

Ticket: https://mijick.atlassian.net/browse/CAL-57

MijickCalendarView.podspec

@@ -0,0 +1,20 @@
+Pod::Spec.new do |s|
+  s.name                  = 'MijickCalendarView'
+  s.summary               = 'Create fully customisable calendar in no time. Keep your code clean'
+  s.description           = <<-DESC
+    MijickCalendarView is a free and open-source library designed for SwiftUI that makes the process of creating calendars easier and much cleaner.
+                               DESC
+
+  s.version               = '1.0.0'
+  s.ios.deployment_target = '14.0'
+  s.osx.deployment_target = '11.0'
+  s.swift_version         = '5.0'
+
+  s.source_files          = 'Sources/**/*'
+  s.frameworks            = 'SwiftUI', 'Foundation', 'Combine'
+
+  s.homepage              = 'https://github.com/Mijick/CalendarView'
+  s.license               = { :type => 'MIT', :file => 'LICENSE' }
+  s.author                = { 'Tomasz Kurylik' => '[email protected]' }
+  s.source                = { :git => 'https://github.com/Mijick/CalendarView', :tag => s.version.to_s }
+end