update readme installation instructions

The readme now links to the wiki for instructions on building from
source. I plan to make many updates to the wiki soon as I start to
provide tarballs for working on the compiler.

README.md

@@ -14,98 +14,12 @@ A general-purpose programming language and toolchain for maintaining
  * [Frequently Asked Questions](https://github.com/ziglang/zig/wiki/FAQ)
  * [Community Projects](https://github.com/ziglang/zig/wiki/Community-Projects)
 
-## Building from Source
+## Installation
 
-[![Build Status](https://dev.azure.com/ziglang/zig/_apis/build/status/ziglang.zig?branchName=master)](https://dev.azure.com/ziglang/zig/_build/latest?definitionId=1&branchName=master)
+ * [download a pre-built binary](https://ziglang.org/download/)
-
+ * [install from a package manager](https://github.com/ziglang/zig/wiki/Install-Zig-from-a-Package-Manager)
-Note that you can
+ * [build from source](https://github.com/ziglang/zig/wiki/Building-Zig-From-Source)
-[download a binary of the master branch](https://ziglang.org/download/#release-master) or 
+ * [bootstrap zig for any target](https://github.com/ziglang/zig-bootstrap)
-[install Zig from a package manager](https://github.com/ziglang/zig/wiki/Install-Zig-from-a-Package-Manager).
-
-### Stage 1: Build Zig from C++ Source Code
-
-This step must be repeated when you make changes to any of the C++ source code.
-
-#### Dependencies
-
-##### POSIX
-
- * cmake >= 2.8.5
- * gcc >= 5.0.0 or clang >= 3.6.0
- * LLVM, Clang, LLD development libraries == 11.x, compiled with the same gcc or clang version above
-   - Use the system package manager, or [build from source](https://github.com/ziglang/zig/wiki/How-to-build-LLVM,-libclang,-and-liblld-from-source#posix).
-
-##### Windows
-
- * cmake >= 3.15.3
- * Microsoft Visual Studio. Supported versions:
-   - 2017 (version 15.8)
-   - 2019 (version 16)
- * LLVM, Clang, LLD development libraries == 11.x
-   - Use the [pre-built binaries](https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows) or [build from source](https://github.com/ziglang/zig/wiki/How-to-build-LLVM,-libclang,-and-liblld-from-source#windows).
-
-#### Instructions
-
-##### POSIX
-
-```
-mkdir build
-cd build
-cmake ..
-make install
-```
-
-Need help? [Troubleshooting Build Issues](https://github.com/ziglang/zig/wiki/Troubleshooting-Build-Issues)
-
-##### MacOS
-
-```
-brew install cmake llvm
-brew outdated llvm || brew upgrade llvm
-mkdir build
-cd build
-cmake .. -DCMAKE_PREFIX_PATH=$(brew --prefix llvm)
-make install
-```
-
-##### Windows
-
-See https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows
-
-### Stage 2: Build Self-Hosted Zig from Zig Source Code
-
-Now we use the stage1 binary:
-
-```
-zig build --prefix $(pwd)/stage2 -Denable-llvm
-```
-
-This produces `stage2/bin/zig` which can be used for testing and development.
-Once it is feature complete, it will be used to build stage 3 - the final compiler
-binary.
-
-### Stage 3: Rebuild Self-Hosted Zig Using the Self-Hosted Compiler
-
-*Note: Stage 2 compiler is not yet able to build Stage 3. Building Stage 3 is
-not yet supported.*
-
-Once the self-hosted compiler can build itself, this will be the actual
-compiler binary that we will install to the system. Until then, users should
-use stage 1.
-
-#### Debug / Development Build
-
-```
-stage2/bin/zig build
-```
-
-This produces `zig-cache/bin/zig`.
-
-#### Release / Install Build
-
-```
-stage2/bin/zig build install -Drelease
-```
 
 ## License