docs(example): add examples

examples/cargo-autodetect.ron

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+(
+    // automatically determine the name of all crates in the workspace and update their version strings
+    cargo: Some(Autodetect),
+)

examples/cargo-manual.ron

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+(
+    // Updates all of the packages in the cargo workspace that match the given names
+    cargo: Some(Packages(["bomper"])),
+)

examples/file-search.ron

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+(
+    by_file: Some({
+        // Attempts to update version strings that match the old version if they are located beneath a line containing the given value
+        "Cargo.toml": ( search_value: Some("bomper"), ),
+        "Cargo.lock": ( search_value: Some("bomper"), ),
+    }),
+)

examples/file-simple.ron

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+(
+    by_file: Some({
+        // naively updates all strings in the files that match the old version
+        "Cargo.toml": ( search_value: None, ),
+        "Cargo.lock": ( search_value: None, ),
+    }),
+)