update readme to fix grammar, spelling, wording (#1058)

I have updated the Readme markdown file to fix certain grammar and spelling issues.

README.md

@@ -2,51 +2,51 @@
 
 # Kotlin/Native  #
 
-_Kotlin/Native_ is a LLVM backend for the Kotlin compiler, runtime
+_Kotlin/Native_ is an LLVM backend for the Kotlin compiler, runtime
-implementation and native code generation facility using LLVM toolchain.
+implementation, and native code generation facility using the LLVM toolchain.
 
  _Kotlin/Native_ is primarily designed to allow compilation for platforms where
-virtual machines are not desirable or possible (such as iOS, embedded targets),
+virtual machines are not desirable or possible (such as iOS or embedded targets),
 or where a developer is willing to produce a reasonably-sized self-contained program
 without the need to ship an additional execution runtime.
 
-Prerequesties:
+Prerequisites:
 	install JDK for your platform, instead of JRE. The build requires ```tools.jar```, which is not included in JRE.
 
-To compile from sources use following steps.
+To compile from sources use following steps:
 
-First download dependencies:
+First, download dependencies:
 
 	./gradlew dependencies:update
 
-Then build the compiler and libraries:
+Then, build the compiler and libraries:
 
 	./gradlew bundle
 
 The build can take about an hour on a Macbook Pro.
-To run a shorter build with only host compiler and libraries run:
+To run a shorter build with only the host compiler and libraries, run:
 
     ./gradlew dist distPlatformLibs
 
-After that you should be able to compile your programs like that:
+After that, you should be able to compile your programs like this:
 
     export PATH=./dist/bin:$PATH
 	kotlinc hello.kt -o hello
 
-For an optimized compilation use `-opt`:
+For an optimized compilation, use `-opt`:
 
 	kotlinc hello.kt -o hello -opt
 
-For some tests, use:
+For tests, use:
 
 	./gradlew backend.native:tests:run
 
-To generate interoperability stubs create library definition file
+To generate interoperability stubs, create a library definition file
-(take a look on [`samples/tetris/.../sdl.def`](https://github.com/JetBrains/kotlin-native/blob/master/samples/tetris/src/main/c_interop/sdl.def)) and run `cinterop` tool like this:
+(refer to [`samples/tetris/.../sdl.def`](https://github.com/JetBrains/kotlin-native/blob/master/samples/tetris/src/main/c_interop/sdl.def)), and run the `cinterop` tool like this:
 
     cinterop -def lib.def
 
-See provided [samples](https://github.com/JetBrains/kotlin-native/tree/master/samples) and [`INTEROP.md`](https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md) for more details.
+See the provided [samples](https://github.com/JetBrains/kotlin-native/tree/master/samples) and [`INTEROP.md`](https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md) for more details.
 
-Interop tool generates library in .klib library format, see [`LIBRARIES.md`](https://github.com/JetBrains/kotlin-native/blob/master/LIBRARIES.md)
+The Interop tool generates a library in the `.klib` library format. See [`LIBRARIES.md`](https://github.com/JetBrains/kotlin-native/blob/master/LIBRARIES.md)
-for more details on the file format.
+for more details on this file format.