Add CHANGELOG and README.md for 0.2.0-alpha1 release

CHANGELOG.md

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+# 0.2.0-alpha1 (May 13, 2020)
+
+### Fixes
+- lots of smaller and niche parsing errors
+
+### Added
+- support for ASN-extensible `CHOICE` and `ENUMERATED` types  
+- `Reader`, `Writer` traits to (de)serialize based on the visitor pattern, asn attribute annotation, see [showcase] and [proc_macro_attribute]. This will allow further ASN encodings to be implemented without further code generation (to be clear, this not on the roadmap for now, but PRs are welcome).
+
+## Changes
+- deprecated `UperSerializer` which generates a lot of complex code for (uper-)serialization. Instead general purpose and less complex code that is based on the visitor pattern will be generated. See [showcase] and commits linked to [#11]. This also allows to write ASN serializable structures without writing ASN itself (see [proc_macro_attribute]):
+
+```rust
+#[asn(sequence)]
+#[derive(Debug, PartialOrd, PartialEq)]
+pub struct Pizza {
+    #[asn(integer(1..4))]
+    size: u8,
+    #[asn(complex(Topping))]
+    topping: Topping,
+}
+
+#[test]
+fn pizza_test_uper_1() {
+    let mut uper = UperWriter::default();
+    let pizza = Pizza {
+        size: 2,
+        topping: Topping::NotPineapple,
+    };
+    uper.write(&pizza).unwrap();
+    // https://asn1.io/asn1playground/
+    assert_eq!(&[0x40], uper.byte_content());
+    assert_eq!(4, uper.bit_len());
+    let mut uper = uper.into_reader();
+    assert_eq!(pizza, uper.read::<Pizza>().unwrap());
+    assert_eq!(0, uper.bits_remaining());
+}
+
+```
+
+[showcase]: tests/showcase.rs
+[proc_macro_attribute]: tests/basic_proc_macro_attribute.rs
+[#11]: https://github.com/kellerkindt/asn1rs/issues/11

asn1rs-macros/README.md

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+# asn1rs macros
+
+Optional part of [asn1rs](https://crates.io/crates/asn1rs)
+
+

asn1rs-model/README.md

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+# asn1rs type definitions
+
+Essential part of [asn1rs](https://crates.io/crates/asn1rs)
+
+