Update README.md

README.md

 # grafana-as-code
+
+## Pre-requisite
+Following tools are needed to build and deploy the project. 
+
+-  jsonnet
+-  curl
+-  jq
+-  tar
+-  git
+
+Please make sure these these tools are available before installations.
+
+# Build `abs-grafana`
+
+Firstly get the latest clone of the code.
+
+
+`git clone https://gitlab.mynisum.com/sbilal/abs-grafana.git`
+
+In order to build all jsonnets, run following command from the root folder of the project.
+
+`scripts/build_all.sh `
+
+If you want to build only dashboards, run following command.
+
+`scripts/build_all.sh dashboards`
+
+If you want to build only alerts, run following command.
+
+`scripts/build_all.sh alerts`
+
+All the updated jsons are created in `build` directory under appropriate directories.
+
+Keep creating jsons and enjoy!!!
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