Add basic installation instructions

src/runtime/c/README.md

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+# "Majestic" C Runtime
+
+## Requirements
+
+Required system packages (Debian/Ubuntu):
+```
+autoconf
+automake
+libtool
+make
+g++
+```
+
+## Installation
+
+Installing the runtime (puts libraries in `/usr/local/lib`):
+```
+autoreconf -i
+./configure
+make
+make install
+```
+
+## Using
+
+- Compiling GF with this runtime will require flag `--extra-lib-dirs=/usr/local/lib`.
+- Running GF with this runtime will require environment variable `LD_LIBRARY_PATH=/usr/local/lib`