Add permissions example file for RNS FileSync with usage guidelines and examples

permissions.example

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+# RNS FileSync Permissions File
+#
+# Format: identity_hash permissions
+# Permissions: read, write, delete (comma-separated)
+#
+# Lines starting with # are comments
+# Whitespace and empty lines are ignored
+
+# Examples:
+
+# Full access for a specific peer
+# a1b2c3d4e5f6g7h8 read,write,delete
+
+# Read-only access for a peer
+# 9876543210fedcba read
+
+# Read and write, but no delete
+# abc123def456 read,write
+
+# Wildcard: allow all peers with specific permissions
+# Use * to allow any peer to connect with the specified permissions
+# * read
+
+# Public read-only server (anyone can download files)
+# * read
+
+# Semi-public (anyone can read/write, but not delete)
+# * read,write
+
+# Private: Only specific peers (no wildcard)
+b559704616f042e0b7b6ba46ada4c670 read,write,delete
+20d1f3debb50dde3df2cff74413b0f0d read,write
+