Document dependencies

docs/Dependencies.md

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+# Ubuntu 14.04
+
+Note that some of these dependencies are only required for building
+CoreCLR and CoreFX on Linux. We should find a reduced set for
+PowerShell on Linux itself.
+
+Note that the distributed version of Mono is too old for .NET
+projects, the [CoreCLR][] docs point to the [Mono][] docs on how to
+install an up-to-date version.
+
+Also note that the distributed version of Git has a bug with `git
+clean -fdx` and submodules. I would recommned upgrading.
+
+[CoreCLR]: https://github.com/dotnet/coreclr/blob/master/Documentation/building/linux-instructions.md
+[Mono]: http://www.mono-project.com/docs/getting-started/install/linux/
+
+```sh
+sudo su
+
+echo "Adding Mono Project repository"
+echo "deb http://download.mono-project.com/repo/debian wheezy main" | tee /etc/apt/sources.list.d/mono-xamarin.list
+apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+
+apt-get update
+
+apt-get install -y \
+	git \
+	wget \
+    mono-devel \
+    gcc \
+    g++ \
+    llvm-3.5 \
+    clang-3.5 \
+    lldb-3.6 lldb-3.6-dev \
+    strace \
+    libicu-dev \
+    libunwind8 libunwind8-dev \
+    libssl-dev \
+    libcurl4-openssl-dev \
+    libpam0g-dev \
+    make \
+    cmake \
+    gettext
+```
+
+# Arch Linux
+
+It's Arch, everything is already new enough.
+
+```
+sudo pacman --noconfirm -S git wget gcc mono make cmake icu pam lldb strace
+```