Update building_running_fuzzers.md

docs/building_running_fuzzers.md

@@ -1,2 +1,37 @@
 # Building and Running Fuzzers
 
+* This page documents building and running fuzzers as part of an OSS project. *
+
+## Prerequisites
+
+[Install Docker]. The toolchain setup necessary to build coverage-guided fuzzers is complicated. Docker is used
+to simplify distribution of the toolchain and to produce repeatable results for distributed execution.
+
+## Building Fuzzers
+
+Building fuzzer is a two-step process:
+
+1. Building a container ready to compile fuzzers: 
+````bash
+# in project directory; replace/define PROJECT_NAME
+docker build -t ossfuzz/$PROJECT_NAME .
+````
+2. Running a container:
+````bash
+# in project directory; replace/define PROJECT_NAME
+docker run -ti -v $PWD:/src/$PROJECT_NAME -v /tmp/out:/out ossfuzz/$PROJECT_NAME
+````
+
+`/tmp/out` will contain fuzzers.
+
+## Running Fuzzers
+
+Fuzzers are statically linked executables and could be executed normally in Unbuntu-like environment.
+When Ubuntu environment is not aviable (or restricted environemnt is desirable), the fuzzer can easly be run inside docker 
+container:
+
+````bash
+docker run -ti -v /tmp/out:/out -t ossfuzz/libfuzzer-runner /out/some_fuzzer_name --runs=100
+````
+
+[Install Docker]: https://docs.docker.com/engine/installation/