add readme and license files

Author: skylot

LICENSE

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+MIT License
+
+Copyright (c) 2021-present Skylot and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Raung
+
+**raung** - yet another assembler/disassembler for java bytecode.
+
+Similar to [Krakatau](https://github.com/Storyyeller/Krakatau) and [Smali](https://github.com/JesusFreke/smali),
+based on [ASM](https://asm.ow2.io/) library.
+
+:exclamation: Warning: this project at a very early stage of development, many features not yet finished and syntax not stable.
+
+
+### Syntax example:
+```smali
+.version 52
+.class public HelloWorld
+.source "HelloWorld.java"
+
+.method public static main([Ljava/lang/String;)V
+	.max stack 2
+	.max locals 1
+
+	.local 0 "args" [Ljava/lang/String;
+	.line 4
+	getstatic java/lang/System out Ljava/io/PrintStream;
+	ldc "Hello, World!"
+	invokevirtual java/io/PrintStream println (Ljava/lang/String;)V
+	.line 5
+	return
+.end method
+```
+
+---------------------------------------
+*Licensed under the MIT License*