add an example

examples/lr-tddft/lcao_H2O/INPUT

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+INPUT_PARAMETERS
+#Parameters (1.General)
+suffix                  abacus
+pseudo_dir              ../../../tests/PP_ORB
+orbital_dir                 ../../../tests/PP_ORB
+calculation             scf
+nbands                23
+symmetry               	0
+
+#Parameters (2.Iteration)
+ecutwfc                 50
+scf_thr                     1e-6
+scf_nmax                   100
+
+#Parameters (3.Basis)
+basis_type              lcao 
+gamma_only              1
+
+#Parameters (4.Smearing)
+smearing_method                gaussian
+smearing_sigma                   0.02
+
+#Parameters (5.Mixing)
+mixing_type             pulay
+mixing_beta             0.4
+
+nstates 2
+xc_kernel lda
+lr_solver dav
+lr_thr 1e-6
+pw_diag_ndim 2
+
+esolver_type ks-lr
+out_alllog	1
+# out_wfc_lcao 1
+# out_chg 1
+
+nvirt 19

examples/lr-tddft/lcao_H2O/STRU

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+ATOMIC_SPECIES
+H 1.008 H_ONCV_PBE-1.0.upf
+O 15.9994 O_ONCV_PBE-1.0.upf
+
+NUMERICAL_ORBITAL
+H_gga_8au_60Ry_2s1p.orb
+O_gga_7au_60Ry_2s2p1d.orb
+
+NUMERICAL_DESCRIPTOR
+jle.orb
+
+
+LATTICE_CONSTANT
+1
+
+LATTICE_VECTORS
+28 0 0
+0 28 0
+0 0  28
+
+ATOMIC_POSITIONS
+Cartesian
+
+H
+0
+2
+-12.046787058887078 18.76558614676448 8.395247471328744 1 1 1
+-14.228868795885418 20.61549300274637 7.611989524516571 1 1 1
+O
+0
+1
+-13.486789117423204 19.684192208418636 8.958321352749174 1 1 1