Impl Display for Grammems structs. Added readme. Reworked lexeme detection - now stores all the lexemes order by weight.

README.md

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+# MyStem Rust Wrapper
+
+Rust wrapper for the Yandex MyStem 3.1 morpholocial analyzer of the Russian language.
+
+#### System Requrements
+The wrapper was tested on Ubuntu Linux 18.04+, Windows 10. 
+Mystem binary should be accessible via PATH so manual installation is required. [MyStem Web Site](https://yandex.ru/dev/mystem/)
+
+###A Quick Example
+
+```rust
+let mut instance = mystem::MyStem::new()?;
+for stem in instance.stemming("Связался с лучшим - подохни как все.".into())? {
+    println!(
+        "'{}' most likely is a '{}' and lexeme is '{}'.",
+        stem.text,
+        stem.lex[0].grammem.part_of_speech,
+        stem.lex[0].lex
+    )
+}
+
+//'Связался' most likely is a 'Verb' and lexeme is 'связываться'.
+//'с' most likely is a 'Preposition' and lexeme is 'с'.
+//'лучшим' most likely is a 'Adjective' and lexeme is 'хороший'.
+//'подохни' most likely is a 'Verb' and lexeme is 'подыхать'.
+//'как' most likely is a 'Conjunction' and lexeme is 'как'.
+//'все' most likely is a 'AdjectivePronoun' and lexeme is 'весь'.
+
+```