docs: Add READMEs

Signed-off-by: Julien Riou <julien@riou.xyz>

src/cmd/coller/README.md

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+# coller
+
+CLI to create notes.
+
+# Usage
+
+```
+coller -help
+```
+
+# Examples
+
+Create from clipboard:
+
+```
+coller
+```
+
+Create from file:
+
+```
+coller -file filename.txt
+```
+
+Provide password for encryption:
+
+```
+coller -ask-password
+coller -password PASSWORD
+```
+
+Create public note:
+
+```
+coller -no-password
+```
+
+Return the copier command to use client-side decryption instead of the URL:
+
+```
+coller -copier
+```

src/cmd/collerd/README.md

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+# collerd
+
+Server to manage notes:
+* Website
+* API
+* Database management
+
+## Usage
+
+```
+collerd -help
+```
+
+## Configuration
+
+The file format is **JSON**:
+
+* **title** (string): Title of the website
+* **database_type** (string): Type of the database (default "sqlite", "postgres" also supported)
+* **database_dsn** (string): Connection string for the database (default "collerd.db")
+* **id_length** (int): Number of characters for note identifiers (default 5)
+* **password_length** (int): Number of characters for generated passwords (default 16)
+* **expiration_interval** (int): Number of seconds to wait between two expiration runs
+* **listen_address** (string): Address to listen for the web server (default "127.0.0.1")
+* **listen_port** (int): Port to listen for the web server (default 8080)
+* **expirations** ([]int): List of supported expiration times in seconds (default 300, 86400, 604800, 18144000)
+* **expiration** (int): Default expiration time in seconds
+* **max_upload_size** (int): Maximum number of bytes received by the server for notes (the base64 encoding may use more space than the real size of the note)
+* **show_version** (bool): Show version on the website
+
+The configuration file is not required but the service might not be exposed to the public.

src/cmd/copier/README.md

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+# copier
+
+CLI to download and decrypt notes from the client.
+
+# Usage
+
+```
+copier -help
+```
+
+# Examples
+
+```
+copier -password PASSWORD URL
+copier -w URL
+```