Add signing changes feature to README

Dependencies

• [2] 6LCROYAR Add known issue with deleted file names to README
• [3] NL47PGQC Update README
• [4] NCBEWRYE Initialize Repository
• [5] SDZNGGDN Update README to add changelog and channel views as features

Change contents

• replacement in README.md at line 26
  [3.112088]→[2.0:125](∅→∅)
  − - On the Source Control View, deleted files show up as their parent directory (This is the result of a Pijul CLI limitation)
  [3.112088]

  [3.112183]
  + - On the Source Control View, deleted files show up as their parent directory (This is the result of a Pijul CLI limitation).

  + - Not all actions refresh the appropriate views, manual refreshing is required in a number of places
• replacement in README.md at line 54
  [3.112501]→[3.1928:2087](∅→∅)
  − There are also a number of Pijul features which still need implementation to reach a publishable minimum viable product, suitable for local Pijul development:
  [3.112501]

  [3.2087]
  + There are also a number of Pijul features which still need to be implemented to reach a publishable minimum viable product, suitable for local Pijul development:
• edit in README.md at line 59
  [3.2206]

  [3.112613]
  + - Signing changes