Add snapcraft files

dist/snapcraft/snap/gui/picocrypt.desktop

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+[Desktop Entry]
+Type=Application
+Terminal=false
+Name=Picocrypt
+Exec=picocrypt
+Icon=${SNAP}/meta/gui/picocrypt.svg

dist/snapcraft/snap/gui/picocrypt.svg

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dist/snapcraft/snapcraft.yaml

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+name: picocrypt
+summary: A very small, very simple, yet very secure encryption tool.
+description: Picocrypt is a very small, very simple, yet very secure encryption tool that you can use to protect your files. It's designed to be the go-to tool for encryption, with a focus on security, simplicity, and reliability. Picocrypt uses the secure XChaCha20 cipher and the Argon2id key derivation function to provide a high level of security, even from three-letter agencies like the NSA. Your privacy and security is under attack. Take it back with confidence by protecting your files with Picocrypt.
+version: "1.49"
+confinement: strict
+base: core22
+grade: stable
+
+apps:
+  picocrypt:
+    command: bin/Picocrypt
+    environment:
+      NO_AT_BRIDGE: 1
+      LIBGL_ALWAYS_SOFTWARE: 1
+    extensions: [gnome]
+    plugs:
+      - home
+
+parts:
+  picocrypt:
+    plugin: go
+    source: .
+    build-packages:
+      - gcc
+      - xorg-dev
+      - libgtk-3-dev
+      - libgl1-mesa-dev
+      - libglu1-mesa-dev
+      - libffi-dev
+    build-snaps:
+      - go
+    stage-packages:
+      - libc6
+      - libgcc-s1
+      - libgl1
+      - libglu1-mesa
+      - libgtk-3-0
+      - libstdc++6
+      - libx11-6
+      - libffi7