examples: add solana sdk examples

Change-Id: I2f0cc982c880ba1830ad1e1c4a4a409876c4ad66

examples/messenger/common/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "wormhole-messenger-common"
+version = "0.1.0"
+edition = "2018"
+
+[lib]
+name = "messenger_common"
+crate-type = ["cdylib", "lib"]
+
+[dependencies]
+borsh = "0.8.1"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]

examples/messenger/common/src/lib.rs

@@ -0,0 +1,13 @@
+use borsh::{
+    BorshDeserialize,
+    BorshSerialize,
+};
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, PartialEq)]
+pub struct Message {
+    /// Messenger/DM username.
+    pub nick: String,
+
+    /// Message text to be output on the target networks node logs.
+    pub text: String,
+}

examples/messenger/rustfmt.toml

@@ -0,0 +1,21 @@
+# Uses 2018 for maximum compatibiilty with Solana.
+edition = "2018"
+
+# Merge similar crates together to avoid multiple use statements.
+imports_granularity = "Module"
+
+# Consistency in formatting makes tool based searching/editing better.
+empty_item_single_line = false
+
+# Easier editing when arbitrary mixed use statements do not collapse.
+imports_layout = "Vertical"
+
+# Default rustfmt formatting of match arms with branches is awful.
+match_arm_leading_pipes = "Preserve"
+
+# Align Fields
+enum_discrim_align_threshold = 80
+struct_field_align_threshold = 80
+
+# Allow up to two blank lines for grouping.
+blank_lines_upper_bound = 2